Add support for non-OpenShift K8s to managed-gitops, testing via k3d

[jgwest]

Description:

• Add support for non-OpenShift K8s to managed-gitops, primarily by removing references to Routes and ArgoCD CR
• Add initial testing via k3d

Link to JIRA Story (if applicable): N/A

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jgwest

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[openshift-ci]

@jgwest: The following tests 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/managed-gitops-e2e-tests	7b5aac9	link	true	/test managed-gitops-e2e-tests
ci/prow/images	7b5aac9	link	true	/test images

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