Update handling of namespace watching:

[jacobweinstock]

Description

CLI flag to watch one or all namespaces.

Why is this needed

Fixes: #

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 30.75%. Comparing base (8c7a9c8) to head (348742d).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/tink-controller/main.go	0.00%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1011      +/-   ##
==========================================
- Coverage   30.86%   30.75%   -0.11%     
==========================================
  Files          75       75              
  Lines        3923     3937      +14     
==========================================
  Hits         1211     1211              
- Misses       2617     2631      +14     
  Partials       95       95              

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