WIP: 🌱Add initial Rosa machine pool integration tests

[PanSpagetka]

What type of PR is this?

What this PR does / why we need it:

Adding basic integration tests for ROSAMachinePoolReconciler. One test case for creating new machine pool and for deleting.

To be able to mock OCM and STS calls I had to do small refactoring.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• includes emojis
• adds unit tests
• adds or updates e2e tests

Release note:

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: PanSpagetka / name: Robin Knaur (f2c32f1)

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[k8s-ci-robot]

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