DM-46503: Implement Mermaid for pipeline and quantum graph visualization

[enourbakhsh]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Attention: Patch coverage is 42.43323% with 194 lines in your changes missing coverage. Please review.

Project coverage is 82.11%. Comparing base (269e412) to head (4defcf6).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...pipe/base/pipeline_graph/visualization/_mermaid.py	0.00%	114 Missing ⚠️
python/lsst/pipe/base/mermaid_tools.py	51.21%	65 Missing and 15 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   83.22%   82.11%   -1.12%     
==========================================
  Files         103      106       +3     
  Lines       12227    12564     +337     
  Branches     1546     1608      +62     
==========================================
+ Hits        10176    10317     +141     
- Misses       1641     1821     +180     
- Partials      410      426      +16     

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