Trigger a reconcile when EnvoyProxy backendRefs changes

[zirain]

fixes: #3412

[codecov]

Codecov Report

Attention: Patch coverage is 89.70588% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 67.17%. Comparing base (c348370) to head (46f945e).

Files	Patch %	Lines
internal/provider/kubernetes/predicates.go	70.00%	2 Missing and 1 partial ⚠️
internal/provider/kubernetes/controller.go	0.00%	1 Missing and 1 partial ⚠️
internal/provider/kubernetes/indexers.go	96.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3472      +/-   ##
==========================================
+ Coverage   67.09%   67.17%   +0.07%     
==========================================
  Files         166      166              
  Lines       19618    19686      +68     
==========================================
+ Hits        13163    13224      +61     
- Misses       5504     5508       +4     
- Partials      951      954       +3     

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[arkodg]

LGTM thanks !

[guydc]

LGTM!