Baseline: e2ae73fe

Cherry picks:

   + 0fdb4854:
     Automated rollback of commit
     f2230d84.
   + 1f52e9a5:
     Support rolling releases in Bazel release scripts.
   + 2f722441:
     Fix syntax error in Bazel release scripts
   + 4ef9c566:
     Fix location of -prerelease option
   + a6dfd927:
     Add --experimental_shadowed_action to graveyard options for all
     commands.

Important changes:

  - If all strategies of one branch (the local or remote execution
    branch) of the `dynamic` strategy fail to even accept (via the
    response they give from `canExec`) the action, `dynamic` will now
    try to see if the other branch can accept it. (Trying to run it
    and it failing will still cause a failure if it was the first
    resul...