Test updates for 1.20.4 release

[trdoyle81]

What type of PR is this?

/kind failing-test

What does this PR do / why we need it:
This PR updates the agent images for 1.20.4 RC build.

The tests were previously asserting outdated development image tags (v0.5.0 / v0.5.1), causing them to fail against the current 1.20.4 release release candidate.

Changes include:

• 1-051_validate_argocd_agent_principal_test.go: Bumped the expected principal agent image assertion to v0.7.7.
• 1-052_validate_argocd_agent_agent_test.go: Bumped the expected cluster-side agent image assertion to v0.7.7.

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:

./bin/ginkgo -v -focus="1-051_validate_argocd_agent_principal|1-052_validate_argocd_agent_agent" -r ./test/openshift/e2e/ginkgo/sequential

[openshift-ci]

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[openshift-ci]

@trdoyle81: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/gitops-ocp-4.22-lp-interop-images	0e6870c	link	true	/test gitops-ocp-4.22-lp-interop-images

Full PR test history. Your PR dashboard.

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