[release-1.15] Sequence reconciler reads and watch the config-features configmap

[knative-prow-robot]

This is an automated cherry-pick of #8124

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 67.88%. Comparing base (c3baeda) to head (f900de0).
Report is 1 commits behind head on release-1.15.

Files	Patch %	Lines
pkg/reconciler/sequence/controller.go	63.63%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.15    #8179      +/-   ##
================================================
- Coverage         67.88%   67.88%   -0.01%     
================================================
  Files               368      368              
  Lines             17554    17565      +11     
================================================
+ Hits              11917    11924       +7     
- Misses             4891     4893       +2     
- Partials            746      748       +2     

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[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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