Extend regex to match bitbucket merge commit message

[albertpuente]

Is your feature request related to a problem? Please describe.
Merge commits produce messages which, by default, should match the regexp specified in mergedBranch (called by org.ods.services.GitService.mergedIssueId) which is used to automatically retrieve the issue Id from the message. However, the message Bitbucket produces by default does not match the expected format.

Example of a matching message in previously seen merge commits:

Merge pull request #123 in PROJECT/repo-name from feature/ISSUE-456 to master

* commit '...':

Example of a current non matching message created by Bitbucket in a merge commit:

Pull request #123: abcde

Merge in PROJECT/repo-name from feature/ISSUE-456 to master

* commit '...':

The matching group is the branch name feature/ISSUE-456.

This issue has been found when following the "cleanup preview resources" part of the documentation, and uses the newer context property gitCommitRawMessage introduced after #587.

Describe the solution you'd like
The regexp has been extended to include the new format (preserving backwards compatibility).