Collect ClientSettingsPolicy, ObservabilityPolicy, and NginxProxy count

[bjee19]

Collect count for ClientSettingsPolicies attached at the Gateway level, ClientSettingsPolicies attached at the Route level, ObservabilityPolicies, and NginxProxy.

Problem: I want to collect the number of ClientSettings, Observability, and NginxProxy Policies used in NGF for each context they are used in.

Solution: Collect the counts of the resources.

Testing: Manual testing and addition to unit tests.

Output with a Gateway level ClientSettingsPolicy, a Route level ClientSettingsPolicy, an ObservabilityPolicy, and the NGINXProxy attached.

{"level":"debug","ts":"2024-06-27T21:53:53Z","logger":"telemetryExporter","msg":"Exporting telemetry","data":{"ImageSource":"local","ProjectName":"NGF"…"GatewayAttachedClientSettingsPolicyCount":1,"RouteAttachedClientSettingsPolicyCount":1,"ObservabilityPolicyCount":1,"NginxProxyCount":1,"NGFReplicaCount":1}}

Output with none of the above resources attached:

{"level":"debug","ts":"2024-06-27T21:59:53Z","logger":"telemetryExporter","msg":"Exporting telemetry","data":{"ImageSource":"local","ProjectName":"NGF"…"GatewayAttachedClientSettingsPolicyCount":0,"RouteAttachedClientSettingsPolicyCount":0,"ObservabilityPolicyCount":0,"NginxProxyCount":0,"NGFReplicaCount":1}}

Closes #1898

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

Collect Policy and NGINXProxy count for telemetry data

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.62%. Comparing base (6061483) to head (d02d232).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2179      +/-   ##
==========================================
+ Coverage   87.59%   87.62%   +0.03%     
==========================================
  Files          96       96              
  Lines        6698     6715      +17     
  Branches       50       50              
==========================================
+ Hits         5867     5884      +17     
  Misses        774      774              
  Partials       57       57              

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[sjberman]

In the future, I may consider this a chore, not an enhancement. Not really any direct user value here.