fix(router): proto.Reset stale execution config after manifest reload

[arutkowski00]

Problem

After manifest hot-reload, decoded proto strings from the previous staticExecutionConfig could remain retained even after the new config was assembled.

Fix

After a successful manifest reload, proto.Reset the previous config before retaining the new pointer.

Test plan

• go test ./router/core/...

Part of config hot-reload memory leak investigation (monday.com #3221).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 65c3117e-db20-49fd-a3a9-7706f5ebdaa8

📥 Commits

Reviewing files that changed from the base of the PR and between 7b40f14 and 4c106e7.

📒 Files selected for processing (1)

• router/core/router.go

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.08%. Comparing base (7b40f14) to head (4c106e7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3013      +/-   ##
==========================================
- Coverage   61.42%   54.08%   -7.35%     
==========================================
  Files         259      243      -16     
  Lines       30046    29469     -577     
==========================================
- Hits        18455    15937    -2518     
- Misses      10104    11950    +1846     
- Partials     1487     1582      +95     

Files with missing lines	Coverage Δ
router/core/router.go	69.36% <100.00%> (-1.12%)	⬇️

... and 132 files with indirect coverage changes

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