Remove feature flag for kubernetes version 1.23

[mitalipaygude]

Issue #, if available:
#2159

Description of changes:
Remove feature flag for kubernetes version 1.23

Testing (if applicable):

• make
• make e2e

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #2891 (c145c79) into main (127164d) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2891      +/-   ##
==========================================
+ Coverage   61.57%   61.60%   +0.03%     
==========================================
  Files         323      323              
  Lines       26364    26356       -8     
==========================================
+ Hits        16233    16237       +4     
+ Misses       8860     8848      -12     
  Partials     1271     1271              

Impacted Files	Coverage Δ
pkg/features/features.go	11.11% <ø> (+1.35%)	⬆️
pkg/validations/cluster.go	88.46% <ø> (+0.96%)	⬆️
...idations/createvalidations/preflightvalidations.go	0.00% <ø> (ø)
...dations/upgradevalidations/preflightvalidations.go	100.00% <ø> (ø)
pkg/gitops/flux/client.go	100.00% <0.00%> (ø)
pkg/gitops/flux/flux.go	84.09% <0.00%> (+0.75%)	⬆️

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[mitalipaygude]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mitalipaygude

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