✨ Loosen the filter used for image lookups

[detiber]

What this PR does / why we need it:

Currently image lookups are pretty strict about format, this loosens the image lookup filter while still retaining backward compatiblity for existing images produced.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: detiber

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[detiber]

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

[detiber]

/assign @dims
/assign @rudoi

[detiber]

e2e test failure was a flake in 1 out of 13 tests

[detiber]

/assign @ncdc

[detiber]

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

want to test just long enough to verify that the lookups still work

[ncdc]

/hold
/lgtm

[detiber]

At least one of the e2e tests has successfully passed, which means it successfully did the lookup for the existing image :)
/hold cancel

[k8s-ci-robot]

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

Test name	Commit	Details	Rerun command
pull-cluster-api-provider-aws-e2e	5170c58	link	/test pull-cluster-api-provider-aws-e2e

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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