chore(release): cherry-pick v0.55.0-rc6 to release/0.55

[DariuszPorowski]

Cherry-pick 8 commit(s) from main into release/0.55 for v0.55.0-rc6.

SHA	Message
ec31890	Flaky test fixes for race conditions and timing issues (#11339)
2e7a823	feat(codeowners): add on-call to manage github actions updates (#11342)
6f3a62f	Add change detection to unit-tests.yaml to skip tests on doc-only changes (#11283)
e184868	Add issue investigator agent from Drasi repo (#11221)
231932b	Bump the github-actions group across 1 directory with 9 updates (#11341)
0a710f8	Architecture skill with Mermaid pattern documentation (#11281)
8e26c85	allow upgrade to pass when upgrading between rcs (#11351)
d912167	chore(release): v0.55.0-rc6 (#11352)

[radius-functional-tests]

Radius functional test overview

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Click here to see the test run details

Name	Value
Repository	radius-project/radius
Commit ref	87baca6
Unique ID	func6cab9e66d6
Image tag	pr-func6cab9e66d6

• gotestsum 1.13.0
• KinD: v0.29.0
• Dapr: 1.14.4
• Azure KeyVault CSI driver: 1.4.2
• Azure Workload identity webhook: 1.3.0
• Bicep recipe location ghcr.io/radius-project/dev/test/testrecipes/test-bicep-recipes/<name>:pr-func6cab9e66d6
• Terraform recipe location http://tf-module-server.radius-test-tf-module-server.svc.cluster.local/<name>.zip (in cluster)
• applications-rp test image location: ghcr.io/radius-project/dev/applications-rp:pr-func6cab9e66d6
• dynamic-rp test image location: ghcr.io/radius-project/dev/dynamic-rp:pr-func6cab9e66d6
• controller test image location: ghcr.io/radius-project/dev/controller:pr-func6cab9e66d6
• ucp test image location: ghcr.io/radius-project/dev/ucpd:pr-func6cab9e66d6
• deployment-engine test image location: ghcr.io/radius-project/deployment-engine:latest

Test Status

⌛ Building Radius and pushing container images for functional tests...
✅ Container images build succeeded
⌛ Publishing Bicep Recipes for functional tests...
✅ Recipe publishing succeeded
⌛ Starting corerp-cloud functional tests...
⌛ Starting ucp-cloud functional tests...
✅ ucp-cloud functional tests succeeded
✅ corerp-cloud functional tests succeeded

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.09%. Comparing base (2b2b53d) to head (87baca6).

Additional details and impacted files

@@               Coverage Diff                @@
##           release/0.55   #11355      +/-   ##
================================================
- Coverage         51.18%   51.09%   -0.09%     
================================================
  Files               682      699      +17     
  Lines             43433    44067     +634     
================================================
+ Hits              22231    22517     +286     
- Misses            19062    19402     +340     
- Partials           2140     2148       +8     

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