Do not validate Bitbucket Server by Api request

[vinokurig]

What does this PR do?

Remove the 'isApiRequestRelevant()' function from the Bitbucket Server flow. The function tests the given url if it belongs to Bitbucket Server by doing a user request. Bitbucket Server returns an empty string for unauthorized user without any specific messages. This is a problem as other unsupported git services might work in the same way, so we can not relay on that because if some unsupported git service also returns an empty string on an unsupported api request, the function will incorrectly mark the given url as Bitbucket Server.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

fixes eclipse-che/che#23303

How to test this PR?

see eclipse-che/che#23303

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Release Notes

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vinokurig

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[openshift-ci]

@vinokurig: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v14-bitbucket-no-pat-oauth-flow	5c2963a	link	true	/test v14-bitbucket-no-pat-oauth-flow
ci/prow/v14-che-smoke-test	5c2963a	link	true	/test v14-che-smoke-test
ci/prow/v14-github-no-pat-oauth-flow-raw-devfile-url	5c2963a	link	true	/test v14-github-no-pat-oauth-flow-raw-devfile-url

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