Do not delete overriden security groups

[sedefsavas]

/kind bug

What this PR does / why we need it:
We were deleting SGs looking at Status, which also includes overridden SGs.
Instead, during SG deletion, this PR only deletes the ones that have sigs.k8s.io/cluster-api-provider-aws/cluster/name: owned tag.

Also, allows overriding SGs partially. Before all default SGs must have been overridden or seeing this error:
"msg"="failed to reconcile security groups" "error"="security group overrides have been provided for some but not all roles - missing security group for role bastion" "cluster"="tagleme" "name"="tagleme" "namespace"="default" "reconciler group"="infrastructure.cluster.x-k8s.io" "reconciler kind"="AWSCluster"

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 #2548

Special notes for your reviewer:

Checklist:

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

Release note:

Do not delete security groups when provided as overrides

[0xVox]

Pulled this in and tested; it's fixed on my end! - thanks again for a really quick turnaround!

EDIT: Hang on, need to test again, but looks like we've still deleted all of the rules in the security groups (But not the SGs themselves)

EDIT 2: Yep, confirmed. delete op on AWSCluster no longer deleting the SGs, but all of the rules in the provided security groups still get deleted.

[sedefsavas]

Thanks for checking, I will see what is going on.

[sedefsavas]

Found the issue, we were revoking the rules for all SGs. Now fixed.
Thanks for catching this @0xVox

[k8s-ci-robot]

@sedefsavas: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-cluster-api-provider-aws-e2e-blocking	7126bf6	link	/test pull-cluster-api-provider-aws-e2e-blocking

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[randomvariable]

/lgtm
/approve

will sort out the e2e in post tomorrow

[k8s-ci-robot]

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/priority important-soon