JENKINS-73658 Support regex for tag filter

[camjcorley]

This PR adds logic to allow for a regex filter to be used for the tagFilter. The changes include:

• Add this new option to the parameter description displayed in Jenkins.
• If the tagFilter supplied starts with a forward slash ('/') it is assumed to be a regex pattern. As a result, the git client call for tags will use an asterisk instead of the tagFilter (pulling all tag names).
• If we're using a regex pattern, only tags that match will be included.

Testing done

In a local instance of Jenkins, installed the plugin and ensured the following patterns functioned as desired:

• No filter ('').
• A plain text filter ('dev').
• A wildcard text filter ('staging*').
• A regex pattern filter ('/.(dev|staging).').

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira: https://issues.jenkins.io/browse/JENKINS-73658
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[camjcorley]

Let me know if you have any feedback or would like this implemented differently. Thanks!

[camjcorley]

@jenkinsadmin @MarkEWaite sorry for the direct ping, this PR has been open for a few months now and I'm hoping to get a review. My team relies on this modification and it would be great to get it into the plugin repository to simplify upgrades to our jenkins instance. Thanks!

[camjcorley]

@jenkinsadmin @MarkEWaite sorry for the direct ping, this PR has been open for a few months now and I'm hoping to get a review. My team relies on this modification and it would be great to get it into the plugin repository to simplify upgrades to our jenkins instance. Thanks!

Looks like a Windows test is failing after I synced my branch with master, possibly due to an Azure outage I see on the jenkinsci jenkins?