docs: Document new verification routines

[olivergondza]

What type of PR is this?

Uncomment only one /kind line, and delete the rest.
For example, > /kind bug would simply become: /kind bug

/kind bug

/kind cleanup

/kind failing-test
/kind enhancement
/kind documentation
/kind code-refactoring

What does this PR do / why we need it:

Drop the outdated testing suite and documentation. Document the new one.

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:

• [n/a] Unit Test
• [n/a] E2E Test

How to test changes / Special notes to the reviewer:

[openshift-ci]

@olivergondza: The label(s) kind/cleanup cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

Uncomment only one /kind line, and delete the rest.
For example, > /kind bug would simply become: /kind bug

/kind bug

/kind cleanup

/kind failing-test
/kind enhancement
/kind documentation
/kind code-refactoring

What does this PR do / why we need it:

Drop the outdated testing suite and documentation. Document the new one.

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:

• [n/a] Unit Test
• [n/a] E2E Test

How to test changes / Special notes to the reviewer:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[olivergondza]

To be merged after redhat-developer/gitops-operator#958