Support manual trigger for a step in a stage

The stages feature in Bitbucket pipelines does not allow manual triggers for a step in a stage at the moment as mentioned in the limitations section

A stage can't contain manually triggered steps, but you can configure a stage to be manually triggered.

The request is to allow the manual triggers for a step in a stage.

Be aware that there are several consciences of having manual triggers inside a stage:

• Partially completed deployment stages can't be continued if another change was subsequently deployed to the same environment. It means that a manual step inside a stage can't be triggered if another pipeline is deployed to the same environment.
• On a stage redeploy manual steps won't be taken into account.