Is your feature request related to a problem?

Once #5133 is merged, two different Updatecli pipelines (different manifest) targeting the same pullrequest will override the pullrequest description depending on which one run last.
It's worth mentioning that the commit won't be overridden, so the real change will be applied but with a wrong pull request description.

Solution you'd like

Bitbucket pull request description doesn't support HTML content.
This is unfortunate as we can't use the same technique used for GitHub/GitLab/Gitea where we use HTML div tag to store pull request metadata such as pipelineid.

Bitbucket supports a very limited version of Markdown so we need to define a new standard content

Alternatives you've considered

No response

Anything else?

No response