cleanup: use url from manifest.cue to download k8s

[timmy-wright]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Start getting all config information from manifest.json/cue instead of hardcoding it.

Which issue(s) this PR fixes:

Requirements:

• [ X] uses conventional commit messages
• [ ] adds unit tests
• [ ] tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[coveralls]

Pull Request Test Coverage Report for Build 9396018292

Details

• 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 75.969%

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Totals
Change from base Build 9391048874:	0.0%
Covered Lines:	2627
Relevant Lines:	3458

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💛 - Coveralls

[cameronmeissner]

closing for now, feel free to reopen