feat: flagd proxy resource ownership

[james-milligan]

This PR

• configures the operator as the resource owner for the flagd proxy deployment
• clean up of mismatched doc reference (kube-flagd-proxy > flags-proxy)

Related Issues

Notes

Follow-up Tasks

How to test

[codecov]

Codecov Report

Merging #442 (2dccb4d) into main (4cbe4f1) will decrease coverage by 0.36%.
The diff coverage is 74.28%.

@@            Coverage Diff             @@
##             main     #442      +/-   ##
==========================================
- Coverage   78.38%   78.02%   -0.36%     
==========================================
  Files          21       21              
  Lines        1346     1365      +19     
==========================================
+ Hits         1055     1065      +10     
- Misses        251      259       +8     
- Partials       40       41       +1     

Impacted Files	Coverage Δ
...rollers/core/flagsourceconfiguration/controller.go	46.37% <0.00%> (ø)
...ollers/core/flagsourceconfiguration/flagd-proxy.go	74.71% <74.71%> (ø)

Flag	Coverage Δ
unit-tests	78.02% <74.28%> (-0.36%)	⬇️

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