[Bug]: Bitbucket, No support for downstream forked PRs

[utkarsh-lambdatest]

Is there an existing issue for this?

• I have searched the existing issues

What is the current behavior?

In bitbucket, we need forked repoSlug in order to download its commit zip or fetch the diff. Currently we don't have forkSlug available so it will give not found error.

What is the expected behavior?

Premerge job should run properly on downstream PRs too.

Steps To Reproduce

Fork your repo from a different workspace and then raise a PR

Version

Test-at-scale Cloud