Introduce MergeTo method for profiles

[iblancasa]

Continuation #13106

• Added Profiles.MergeTo implementation that merges one profile message into another while reconciling their dictionaries and appending
  resource profiles.
  • Added comprehensive unit tests covering both the successful merge path and error propagation when dictionary switching fails.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.16%. Comparing base (73f090c) to head (a3051d1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14091      +/-   ##
==========================================
+ Coverage   92.10%   92.16%   +0.05%     
==========================================
  Files         667      668       +1     
  Lines       41453    41463      +10     
==========================================
+ Hits        38181    38214      +33     
+ Misses       2227     2215      -12     
+ Partials     1045     1034      -11     

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[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[dmathieu]

This can be rebased against the main branch.

[codspeed-hq]

CodSpeed Performance Report

Merging #14091 will not alter performance

_{Comparing iblancasa:mergeto (a3051d1) with main (73f090c)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 71 untouched

[dmathieu]

This looks good to me, but why is it a "chore"? It introduces a new public method, it needs a changelog entry.

[dmathieu]

Could you avoid force-pushing PRs? That breaks the GitHub review interface.