Allow to create non-controller owner reference for resource

[Danil-Grigorev]

Motivation

It is common to specify controller: false owner references on child resources which are intended to be reconciled by other controllers.

Solution

I think it makes sense to include owner_ref method for regular owner reference in addition to controller_owner_ref

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 74.6%. Comparing base (79d23a0) to head (c3c1a9b).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1475     +/-   ##
=======================================
- Coverage   74.7%   74.6%   -0.0%     
=======================================
  Files         79      79             
  Lines       6868    6871      +3     
=======================================
  Hits        5125    5125             
- Misses      1743    1746      +3     

Files	Coverage Δ
kube-core/src/resource.rs	61.4% <0.0%> (-2.1%)	⬇️

[clux]

Sending this through. It's actually not breaking as I originally thought because we have a default impl, so re-marking as changelog-add.