Avoid no-op NATS Broker ingress contract updates

[kahirokunn]

Why

Broker reconciliation rewrote the shared ingress contract and emitted an update event even when the semantic contract was unchanged. That creates unnecessary API traffic and self-induced reconciles.

Proposed Changes

• Skip ConfigMap writes and update events when the Broker ingress contract is unchanged.

[codecov]

Codecov Report

❌ Patch coverage is 77.27273% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.66%. Comparing base (2c86680) to head (af2102d).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/broker/contract/manager.go	63.63%	4 Missing ⚠️
pkg/broker/controller/reconciler.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #797      +/-   ##
==========================================
+ Coverage   43.50%   43.66%   +0.15%     
==========================================
  Files          68       68              
  Lines        4259     4271      +12     
==========================================
+ Hits         1853     1865      +12     
  Misses       2282     2282              
  Partials      124      124              

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[kahirokunn]

/ok-to-test

[kahirokunn]

@astelmashenko Hi ✋ I tested it manually on my local environment and it worked fine. I would appreciate it if you could review the PR when you have time. Thank you 🙏

[astelmashenko]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: astelmashenko, kahirokunn

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• OWNERS [astelmashenko]

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[astelmashenko]

/cherry-pick release-1.22

[astelmashenko]

/cherry-pick release-1.23

[knative-prow-robot]

@astelmashenko: new pull request created: #806

Details

In response to this:

/cherry-pick release-1.22

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[knative-prow-robot]

@astelmashenko: new pull request created: #807

Details

In response to this:

/cherry-pick release-1.23

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.