Allow users to select multiple pipelines when they use the "Run pipelines" option

Problem Definition

Users have the ability to run a pipeline manually

• either from the Pipelines page of a repo > Run pipeline
• or from the commit view: when viewing a commit, there is a "Run pipeline" option
• or from the Branches page of the repo: select Actions for a branch > Run pipeline for a branch

This option allows users to select one pipeline to run at a time.
If they want to run multiple pipelines, they'll need to select "Run pipeline" X times (where X is the number of pipelines they want to run).

This process can be tedious, especially for users who have multiple custom pipelines only and make use of the "Run pipelines" option to trigger their builds.

Suggested Solution

In the "Run pipeline" dialog, allow users to select multiple pipelines to run.

Workaround

The only workaround at the moment would be to create a script that uses our API to trigger a pipeline:

https://developer.atlassian.com/cloud/bitbucket/rest/api-group-pipelines/#api-repositories-workspace-repo-slug-pipelines-post

and in that script include X API calls (where X is the number of pipelines you want to trigger), one for each pipeline.