Reduce usage of deprecated BitbucketRepositoryType.

[falkena]

This PR is a follow up from #518 and #520

Signed-off-by: Alexander Falkenstern [email protected]

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[falkena]

@KalleOlaviNiemitalo would you take a look please? I think, i removed this time usage properly. See https://github.com/jenkinsci/bitbucket-branch-source-plugin/pull/518#discussion_r751337234 and https://github.com/jenkinsci/bitbucket-branch-source-plugin/pull/518#discussion_r751340882