Use LabelsAndGenerationPredicate for ToolchainClusterCache controller

[rajivnathan]

Use LabelsAndGenerationPredicate for ToolchainClusterCache controller to prevent it from reconciling unnecessarily. It's especially relevant since the health checker was included in the ToolchainCluster controller: https://github.com/codeready-toolchain/member-operator/blob/50180a07ca25f97123bf4cc614e801b542beb6cb/main.go#L231 which triggers ToolchainConfig status updates every 10 seconds.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.23%. Comparing base (a6a8525) to head (4a74816).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...nclustercache/toolchaincluster_cache_controller.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #437   +/-   ##
=======================================
  Coverage   78.23%   78.23%           
=======================================
  Files          49       49           
  Lines        2444     2444           
=======================================
  Hits         1912     1912           
  Misses        478      478           
  Partials       54       54           

Files with missing lines	Coverage Δ
...nclustercache/toolchaincluster_cache_controller.go	48.14% <0.00%> (ø)

[ranakan19]

Sweet!
Great catch!