switch priority class to system cluster critical

[OliverMKing]

Description

Switches priority class to system cluster critical. We want to be slightly lower priority than the most critical components, especially the ones that are daemonsets.

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

E2e and unit tested

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[OliverMKing]

/ok-to-test sha=9841a94

[coveralls]

Pull Request Test Coverage Report for Build 7399536530

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 80.92%

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Totals
Change from base Build 7399523664:	0.0%
Covered Lines:	2990
Relevant Lines:	3695

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💛 - Coveralls

[OliverMKing]

/ok-to-test sha=5fb48d2

[OliverMKing]

/ok-to-test sha=5fbf8d2