Set condition severities to warning if control plane not initialized

[sedefsavas]

/kind bug

What this PR does / why we need it:
Sets error severities to warning when cluster has not initialized yet.

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 #3017

Special notes for your reviewer:

Checklist:

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

Release note:

Fix for setting conditions to error severity only when errors are non-transients.

[k8s-ci-robot]

@sedefsavas: This issue is currently awaiting triage.

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[sedefsavas]

/test pull-cluster-api-provider-aws-e2e

[pydctw]

Minor comments but looks good to me.
/lgtm

[richardcase]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: richardcase

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