Add functional tests

[abhijeet-dhumal]

Issue link

Implement functional tests for Instascale

Define use cases for Instascale Implement functional tests covering Instascale use cases Implement GitHub PR check running InstaScale functional tests

What changes have been made

Added functional test to define use cases for instascale to interact with appwrapper-reconciler loop using envtest control plane. ~ Guided by - @sutaakar

Verification steps

• [X] Verify setup-envtest package to run controller specific test in local control plane.
• [X] Verify that test is able to create an appwrapper in local control plane cluster.
• [X] Verify that InstaScale adds finalizer into AppWrapper.
• [X] Verify that InstaScale scaled MachineSet to spin up expected number of machines. Verify that InstaScale scales down MachineSet when AppWrapper is finished.

Checks

• [X] I've made sure the tests are passing.
• Testing Strategy
  • [x] Unit tests
  • [ ] Manual tests
  • [ ] Testing is not required for this change

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sutaakar

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/project-codeflare/instascale/blob/main/OWNERS)~~ [sutaakar] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment