refactor(move-package-alt): Use substring operation instead of lazy regex

[TheMrAI]

Description of change

Minor refactor for move-package-alt, where lazy regex operations were removed in favor of string based ones.

Good to know:
The new package cannot be tested using

external-crates/move $ cargo test -p move-package-alt 

because it will fail on incorrectly identified doctests.

---- crates/move-package-alt/src/dependency/git.rs - dependency::git (line 10) stdout ----
error: expected item, found `.`
 --> crates/move-package-alt/src/dependency/git.rs:11:1
  |
1 | .move/
  | ^ expected item
  |
  = note: for a full list of items that can appear in modules, see <https://doc.rust-lang.org/reference/items.html>

error: aborting due to 1 previous error

This, we do not attempt to fix.
The functional way of running the test is:

external-crates/move $ cargo nextest run -p move-package-alt

If you wonder why the main Cargo.lock file was modified it is because of nextest. Not sure why does it change that, why it doesn't fail the same way as the normal cargo test though.

Links to any relevant issues

fixes #8329

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