[JENKINS-71355] Fix retrieval of Bitbucket Server tags head with special characters

[Dohbedoh]

JENKINS-71355: Fix the single tag retrieval for Bitbucket server. Borken by #708. Should fix #713.

Bitbucket Server /tags/{tagname} API is expecting some characters to be escaped and others not. Which make it difficult to find a suitable solution for possible git tag names.

Proposed fix:

• using the /tags?filterText instead that is working well, and that we use for branches too
• added tests for tags retrieval, including a tag named special-"$;><&#_=@\!|.,/test

I tested the following in Bitbucket Server and also Bitbucket Cloud:

• branch specialbranch-"$;><&#_=@\!|.,/test and a PR from that branch
• tag `special-"$;><&#_=@!|.,/test1
• validated that branch/PR/tags scanning and building all works

Your checklist for this pull request

• Make sure you are requesting to pull a topic/feature/bugfix branch (right side) and not your master branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or in Jenkins JIRA
• Link to relevant pull requests, esp. upstream and downstream changes
• Did you provide a test-case? That demonstrates feature works or fixes the issue.

[Dohbedoh]

cc @lifeofguenter

[lifeofguenter]

Awesome, thanks so much <3