Update 1-051_validate_argocd_agent_principal to use the right image

[varshab1210]

What type of PR is this?

/kind failing-test

What does this PR do / why we need it:

This PR is for fixing a typo from a previous change

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

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[varshab1210]

/test v4.21-e2e