Update rose-stem to extract MOCI and UM-related repos from Git

[ericaneininger]

PR Summary

Code Reviewer: @Pierre-siddall

Update MOCI rose-stem suite to pull from Git repositories for MOCI plus UM (and related repos).

Add shutdown handler to run suite_report to gain a trac.log file. Please note, the suite_report_git.py script called, which resides in the SimSys_Scripts repo, currently defaults to UM as primary source - hence slightly peculiar title in the report!

New lib/python directory is a direct copy from the UM rose-stem

Code Quality Checklist

(Some checks are automatically carried out via the CI pipeline)

• I have performed a self-review of my own code
• My code follows the project's style guidelines
• Comments have been included that aid undertanding and enhance the
  readability of the code
• My changes generate no new warnings

Testing

• I have tested this change locally, using the Moci rose-stem suite
• If any tests fail (rose-stem or CI) the reason is understood and
  acceptable (eg. kgo changes)
• I have added tests to cover new functionality as appropriate (eg. system
  tests, unit tests, etc.)

Test Suite Results - um - TEST_mociRS/run1

Suite Information

Item	Value
Suite Name	TEST_mociRS/run1
Suite User	erica.neininger
Workflow Start	2026-02-04T11:30:07
Groups Run	all

Dependency	Reference	Main Like
moci	ericaneininger/moci@rose_stem_git	False
casim	MetOffice/casim@um13.1	True
jules	MetOffice/jules-internal@um13.1	True
shumlib	MetOffice/shumlib@um13.1	True
socrates	MetOffice/socrates@um13.1	True
ukca	MetOffice/ukca@um13.1	True
um	MetOffice/um@vn13.1	True

Task Information

✅ succeeded tasks - 116

Security Considerations

• I have reviewed my changes for potential security issues
• Sensitive data is properly handled (if applicable)
• Authentication and authorisation are properly implemented (if applicable)

Performance Impact

• Performance of the code has been considered and, if applicable, suitable
  performance measurements have been conducted

AI Assistance and Attribution

• Some of the content of this change has been produced with the assistance
  of Generative AI tool name (e.g., Met Office Github Copilot Enterprise,
  Github Copilot Personal, ChatGPT GPT-4, etc) and I have followed the
  Simulation Systems AI policy
  (including attribution labels)

Documentation

• Where appropriate I have updated documentation related to this change and
  confirmed that it builds correctly

Code Review

• All dependencies have been resolved
• Related Issues have been properly linked and addressed
• CLA compliance has been confirmed
• Code quality standards have been met
• Tests are adequate and have passed
• Documentation is complete and accurate
• Security considerations have been addressed
• Performance impact is acceptable