fix: support ClusterCacheTracker

[mweibel]

What type of PR is this?
/kind bug

What this PR does / why we need it:
ClusterCacheTracker is only enabled if POD_NAME, POD_NAMESPACE, and POD_UID are set.

https://github.com/kubernetes-sigs/cluster-api/blob/5815de795489c3edfca22a2c35cd87d7143d9545/controllers/clustercache/cluster_cache.go#L283-L296

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

fixes manager deployment to enable cluster cache tracker

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @mweibel. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.86%. Comparing base (df608bd) to head (cc6390d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5556   +/-   ##
=======================================
  Coverage   52.86%   52.86%           
=======================================
  Files         272      272           
  Lines       29474    29474           
=======================================
  Hits        15582    15582           
  Misses      13080    13080           
  Partials      812      812           

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[nawazkh]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 7cfe2c109384f078b2f4646a12e5eb456de13b29

[mboersma]

/ok-to-test

[mweibel]

/retest