Capture test case range variable before running sub test in parallel

[karuppiah7890]

/kind bug
/kind failing-test
/kind flake

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #1760

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
  • Fix failing unit tests
    • TestReconcileBastionHosts . Already done in Fix tests in bastion_hosts_test.go file #1754 . I can rebase this PR with main once Fix tests in bastion_hosts_test.go file #1754 is merged
    • TestDeleteBastionHost. Already done in Fix tests in bastion_hosts_test.go file #1754 . I can rebase this PR with main once Fix tests in bastion_hosts_test.go file #1754 is merged
    • TestAzureCluster_ValidateUpdate. I will fix it as part of this PR once I dig and understand what's the problem. Mostly seems like some outdated tests lacking some data are failing. Also the failing tests don't seem to be testing anything relevant when seeing the current code

Release note:

NONE

[k8s-ci-robot]

Hi @karuppiah7890. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[devigned]

/ok-to-test

[devigned]

Outside of resolving the TODOs, the PR lgtm.

[shysank]

/lgtm
I was doing a similar thing here as the new test that I added was not working properly.

[devigned]

/lgtm
/approve

Nice work. Thank you!

[k8s-ci-robot]

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