Make the priority class name configurable in the SPOD configuration

[ccojocar]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Make the priority class name configurable in the SPOD configuration, and it sets the default value to system-node-critical.

This is useful when the spod daemon pod remains in Pending state because there isn't enough capacity on the related not to be scheduled.

Which issue(s) this PR fixes:

Does this PR have test?

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Make the priority class name configurable in th SPOD configuration.

[ccojocar]

/assign @saschagrunert

[ccojocar]

/test e2e-flatcar

[k8s-ci-robot]

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[ccojocar]

/test all

[codecov-commenter]

Codecov Report

Merging #1488 (36db8f2) into main (cecc15c) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1488      +/-   ##
==========================================
- Coverage   43.98%   43.98%   -0.01%     
==========================================
  Files          50       50              
  Lines        5715     5716       +1     
==========================================
  Hits         2514     2514              
- Misses       3080     3081       +1     
  Partials      121      121              

[saschagrunert]

Makes sense, thank you for the enhancement!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ccojocar, saschagrunert

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