Add velero.io APIs availability check in Velero E2E install function.

[blackpiglet]

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Fixes #(issue)

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• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.57%. Comparing base (4c23f66) to head (a6486fb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8942   +/-   ##
=======================================
  Coverage   59.57%   59.57%           
=======================================
  Files         370      370           
  Lines       40278    40278           
=======================================
  Hits        23995    23995           
  Misses      14780    14780           
  Partials     1503     1503           

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[reasonerjt]

LGTM, thanks @blackpiglet