refactor: rename control-plane metrics

[shawnh2]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #3684

[codecov]

Codecov Report

Attention: Patch coverage is 34.24658% with 48 lines in your changes missing coverage. Please review.

Project coverage is 68.76%. Comparing base (ec9945a) to head (6e25023).

Files	Patch %	Lines
...ternal/infrastructure/kubernetes/infra_resource.go	34.28%	23 Missing ⚠️
internal/metrics/otel_metric_counter.go	0.00%	15 Missing ⚠️
internal/xds/cache/snapshotcache.go	0.00%	7 Missing ⚠️
internal/provider/kubernetes/status_updater.go	50.00%	2 Missing ⚠️
internal/message/watchutil.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3727      +/-   ##
==========================================
- Coverage   68.81%   68.76%   -0.05%     
==========================================
  Files         175      175              
  Lines       21524    21523       -1     
==========================================
- Hits        14811    14800      -11     
- Misses       5636     5647      +11     
+ Partials     1077     1076       -1     

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[shawnh2]

will update grafana dashboard in a follow-up PR

[Alice-Lilith]

I'm good with the general good approach, but should fix CI before merging

[shawnh2]

/retest