chore(config): remove obsolete Darling lint allows

[arfa79]

Summary

Removes obsolete crate-level clippy::manual_unwrap_or_default allowances from:

• vector-config-common
• vector-config-macros

These allowances were added because code generated by Darling previously triggered the lint. With Vector's pinned Rust 1.95 toolchain and current dependencies, the lint is no longer triggered, so the suppressions and their workaround comments are unnecessary.

This is intentionally a small, focused cleanup related to #23659.

Vector configuration

N/A. This is a lint-only cleanup with no runtime or configuration changes.

How did you test this PR?

Ran the following checks using Vector's pinned Rust 1.95 toolchain:

• cargo fmt --all -- --check
• cargo clippy -p vector-config-common --all-targets -- -D warnings
• cargo clippy -p vector-config-macros --all-targets -- -D warnings
• cargo test -p vector-config-common
• cargo test -p vector-config-macros

All formatting, Clippy, unit test, and doctest checks passed.

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

• Related: Investigate and eliminate allow statements #23659

Notes

The scope is limited to the matching Darling-generated lint workarounds in vector-config-common and vector-config-macros. No dependencies or runtime behavior were changed

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[thomasqueirozb]

Thanks! We can merge this once you sign the CLA and comment recheck

[arfa79]

I have read the CLA Document and I hereby sign the CLA

[arfa79]

recheck

[arfa79]

@thomasqueirozb The commit author was corrected to use my GitHub-linked noreply address, and the CLA check now passes. The force-push appears to have disabled auto-merge. Could you please enable auto-
merge again when convenient? Thank you!