fix(maven): Parse platform specifiers in Maven package IDs

[elldritch]

Overview

This PR fixes a parsing issue where package IDs with platform specifiers would not parse correctly.

It also adds a unit test as well as an output fixture from the customer who reported this bug - I'm working with them to figure out whether we can actually commit the anonymized customer fixture.

Acceptance criteria

The Maven dependency:tree tactic should work on Maven package IDs that include platforms.

Testing plan

Run cabal test on the unit test, and with the fixture (DM @liftM for the fixture).

References

• ZD-2896

Checklist

• I added tests for this PR's change (or confirmed tests are not viable).
• If this PR introduced a user-visible change, I added documentation into docs/.
• I updated Changelog.md if this change is externally facing. If this PR did not mark a release, I added my changes into an # Unreleased section at the top.
• I linked this PR to any referenced GitHub issues, if they exist.

[skilly-lily]

LGTM, but that package format is so stupid. Optional middle components with identical separators?