nimbus-fml: Make the output deterministic.

[PieroV]

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Changed some HashMaps with BTreeMaps to ensure the order of the output is deterministic.

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • [x] This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
    • There are corresponding PRs for our consumer applications that resolve the breaking changes and have been approved
• [x] Quality: This PR builds and tests run cleanly
  • Note:
    • For changes that need extra cross-platform testing, consider adding [ci full] to the PR title.
    • If this pull request includes a breaking change, consider cutting a new release after merging.
• [x] Tests: This PR includes thorough tests or an explanation of why it does not
  • It doesn't add new features, it changes a data type used here and there
  • Maybe it could be worth to include a test to check the output always follows a certain order, in case could you help me for that? :slightly_smiling_face:
• [x] Changelog: This PR includes a changelog entry in CHANGELOG.md or an explanation of why it does not need one
  • Any breaking changes to Swift or Kotlin binding APIs are noted explicitly
• [x] Dependencies: This PR follows our dependency management guidelines
  • Any new dependencies are accompanied by a summary of the due diligence applied in selecting them.

Branch builds: add [firefox-android: branch-name] to the PR title.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 22.66%. Comparing base (8fd08c6) to head (db52b2b). Report is 522 commits behind head on main.

Files with missing lines	Patch %	Lines
...port/nimbus-fml/src/intermediate_representation.rs	0.00%	2 Missing :warning:
components/support/nimbus-fml/src/parser.rs	0.00%	2 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6283   +/-   ##
=======================================
  Coverage   22.66%   22.66%           
=======================================
  Files         332      332           
  Lines       29804    29804           
=======================================
  Hits         6754     6754           
  Misses      23050    23050           

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[linabutler]

Thanks so much for doing this, @PieroV!

This looks great to me—though it looks like the test fixtures might need updating, from those Clippy and test failures 👀—but let's have Charlie and Beth give the official review.

[PieroV]

I tried to run cargo teston the rebased branch, but I can't find test failures, at most some tests are ignored.

Should I pass additional arguments?