fix: Fixed bug in python model export name mangling.

[zrho]

This PR fixes a bug in the Python model export: Call nodes referred to themselves instead of the function to be called.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.14%. Comparing base (fdc0e75) to head (098e413).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
hugr-py/src/hugr/model/export.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2323   +/-   ##
=======================================
  Coverage   82.14%   82.14%           
=======================================
  Files         242      242           
  Lines       43786    43786           
  Branches    39624    39624           
=======================================
  Hits        35968    35968           
  Misses       5836     5836           
  Partials     1982     1982           

Flag	Coverage Δ
python	85.48% <0.00%> (ø)

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[hugrbot]

This PR contains breaking changes to the public Rust API.
Please deprecate the old API instead (if possible), or mark the PR with a ! to indicate a breaking change.

cargo-semver-checks summary

--- failure feature_missing: package feature removed or renamed ---

Description:
A feature has been removed from this package's Cargo.toml. This will break downstream crates which enable that feature.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#cargo-feature-remove
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.41.0/src/lints/feature_missing.ron

Failed in:
feature hugr-persistent in the package's Cargo.toml
feature persistent_unstable in the package's Cargo.toml

--- failure enum_missing: pub enum removed or renamed ---

Description:
A publicly-visible enum cannot be imported by its prior path. A `pub use` may have been removed, or the enum itself may have been renamed or removed entirely.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.41.0/src/lints/enum_missing.ron

Failed in:
enum hugr_core::hugr::views::render::UnsupportedRenderConfig, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views/render.rs:152
enum hugr_core::hugr::views::render::NodeLabel, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views/render.rs:228

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.41.0/src/lints/inherent_method_missing.ron

Failed in:
Hugr::into_region_portgraph, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/internal.rs:397
Hugr::into_region_portgraph, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/internal.rs:397
SimpleReplacement::map_host_nodes, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/patch/simple_replace.rs:507
SimpleReplacement::map_host_nodes, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/patch/simple_replace.rs:507
SimpleReplacement::map_host_nodes, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/patch/simple_replace.rs:507
SimpleReplacement::map_host_nodes, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/patch/simple_replace.rs:507

--- failure struct_missing: pub struct removed or renamed ---

Description:
A publicly-visible struct cannot be imported by its prior path. A `pub use` may have been removed, or the struct itself may have been renamed or removed entirely.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.41.0/src/lints/struct_missing.ron

Failed in:
struct hugr_core::hugr::views::render::MermaidFormatter, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views/render.rs:34

--- failure trait_method_missing: pub trait method removed or renamed ---

Description:
A trait method is no longer callable, and may have been renamed or removed entirely.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#major-any-change-to-trait-item-signatures
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.41.0/src/lints/trait_method_missing.ron

Failed in:
method mermaid_string_with_formatter of trait HugrView, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views.rs:419
method mermaid_format of trait HugrView, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views.rs:441
method mermaid_string_with_formatter of trait HugrView, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views.rs:419
method mermaid_format of trait HugrView, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views.rs:441
method mermaid_string_with_formatter of trait HugrView, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views.rs:419
method mermaid_format of trait HugrView, previously in file /home/runner/work/hugr/hugr/BASELINE_BRANCH/hugr-core/src/hugr/views.rs:441

[acl-cqc]

Test??

[ss2165]

Testing is in progress here: #2317

[ss2165]

Looks like needs a rebase on main for CI to be happy