api: helper: fix NodeGroup Name

[ffromani]

Problems with the current NodeGroup. ToString() method:

1. string representation of annotations, being them maps, is not stable, and we had no test coverage
2. the string representation can be very long, and in some places (e.g. conditions) we need a much more concise representation.

Fix both issues:

1. make representation of annotations stable
2. shorten a tiny bit ToString() but most notably add a concise GetName() method; use it on validation.

[openshift-ci]

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[ffromani]

/retest-required

[ffromani]

/test ci-e2e-install-hypershift

[openshift-ci]

@ffromani: The following test 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/ci-e2e-install-hypershift	fbe6148	link	true	/test ci-e2e-install-hypershift

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[ffromani]

 INFO[2025-02-05T21:43:12Z] Build src-bundle failed, printing logs:      
INFO[2025-02-05T21:43:14Z] Build src-bundle previously failed from an infrastructure error (FetchImageContentFailed), retrying... 
INFO[2025-02-05T21:43:14Z] Ran for 16m44s                               
ERRO[2025-02-05T21:43:14Z] Some steps failed:         

let's wait