Share multicluster spoke E2E helpers

[kahirokunn]

Proposed Changes

• Move shared spoke-cluster Deployment readiness and deletion, Service cleanup, and anchor ConfigMap cleanup checks into common E2E helpers.

Release Note

NONE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.84%. Comparing base (71eefe9) to head (e3038d7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2347   +/-   ##
=======================================
  Coverage   65.84%   65.84%           
=======================================
  Files          56       56           
  Lines        2673     2673           
=======================================
  Hits         1760     1760           
  Misses        777      777           
  Partials      136      136           

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[kahirokunn]

@dsimansk Hi ✋ PTAL. Thank you 🙏

[dsimansk]

/approve
/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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