✨ Allow accepting self-hosted gitlab installations

[ts-mini]

What this PR does / why we need it: The current implementation of the gitlab check uses HasPrefix - which doesn't allow for a gitlab whose domain could be different (gitlab-example.domain.com)

Which issue(s) this PR fixes:
Fixes #705

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[furkatgofurov7]

/ok-to-test

[alexander-demicev]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexander-demicev

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• OWNERS [alexander-demicev]

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[furkatgofurov7]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Details

Git tree hash: 35686f6620c4a71138cf90e1bca9dc5b953d95da

[furkatgofurov7]

/retitle ✨ Allow accepting self-hosted gitlab installations