fix: Fully replace pipelines on Writable.Pipeline update

[jesson1]

Problem

When Writable.Pipeline is updated, the runtime previously only updated topics/transforms per pipeline ID. This PR changes the update to a full replacement: pipelines absent from the new config are removed (and their metrics unregistered) and new pipelines are created and registered. Incoming topics are expanded with the message-bus base prefix.

What changed

• Build full topics using base topic prefix before applying config.
• Replace per-field setters with UpdateFunctionsPipelines(...).
• UpdateFunctionsPipelines:
  • acquires a lock,
  • unregisters metrics and deletes pipelines not in the new config,
  • creates new FunctionPipeline instances and registers their metrics.

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)
  

Testing Instructions

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.23%. Comparing base (a15e946) to head (26d5ce6).

Files with missing lines	Patch %	Lines
internal/runtime/runtime.go	0.00%	16 Missing ⚠️
internal/app/configupdates.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1748      +/-   ##
==========================================
- Coverage   43.41%   43.23%   -0.19%     
==========================================
  Files          64       64              
  Lines        4959     4980      +21     
==========================================
  Hits         2153     2153              
- Misses       2663     2684      +21     
  Partials      143      143              

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