Fix unsupported override for velero image

[dymurray]

No description provided.

[kaovilai]

https://github.com/openshift/oadp-operator/search?q=veleroPluginImageFqin
docs should also update

[codecov-commenter]

Codecov Report

Merging #544 (89994b5) into master (6afa402) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #544   +/-   ##
=======================================
  Coverage   37.69%   37.69%           
=======================================
  Files          13       13           
  Lines        2815     2815           
=======================================
  Hits         1061     1061           
  Misses       1673     1673           
  Partials       81       81           

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[weshayutin]

/test 4.8-operator-e2e

[weshayutin]

+1

[dymurray]

/retest

[openshift-ci]

@dymurray: all tests passed!

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