[RELEASE] cugraph v22.08

[GPUtester]

❄️ Code freeze for branch-22.08 and v22.08 release

What does this mean?

Only critical/hotfix level issues should be merged into branch-22.08 until release (merging of this PR).

What is the purpose of this PR?

• Update documentation
• Allow testing for the new release
• Enable a means to merge branch-22.08 into main for the release

[review-notebook-app[bot]]

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[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@de8036b). Click here to learn what that means. The diff coverage is n/a.

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