2000689 - Add ability to select multiple trains to `moz-phab uplift`

Status: NEW

(Conduit :: moz-phab, enhancement, P2)

Description

[Connor Sheehan [:sheehan]]

• Change the --train argument to moz-phab uplift to accept multiple targets.
• Change moz-phab uplift to run through the current uplift flow for each target train.
  • git fetch origin to ensure each remote branch is up to date.
  • For the given commit range, apply to the current remote branch commit.
    • If the stack applies successfully, create new revisions in Phabricator and track the tip commit in the stack.
    • If the stack does not apply successfully, track the merge conflict failures.
  • On completion:
    • Print a status report showing which uplifts applied successfully and which failed.
    • Print detailed instructions on how to manually resolve merge conflicts and re-submit, with linking to the submitted uplift request form.