fix: update the existing plugin deployment resource

[chetan-rns]

What type of PR is this?

/kind bug

What does this PR do / why we need it:

• The reconciler doesn't properly update the existing plugin Deployment resource in the cluster. Instead, it tries to update the desired object leading to a reconciliation loop. Since the desired resource doesn't have the resource version and other metadata the resource gets updated triggering the loop.

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[jgwest]

/retest

[jgwest]

/retest

        --- FAIL: kuttl/harness/1-074_validate_terminating_namespace_block (25.42s) 

plus 2 cluster flakes

[jgwest]

/retest

cluster flakes AFAICT

[jgwest]

LGTM, thanks @chetan-rns!