dispatch-ci being added to places it shouldn't be

[GuySartorelli]

The dispatch-ci script should not run for workflows (gha-* repos), or for docs - and possible for other things as well. We should update the script so that:

1. Only repos that should have it are given it
2. It's removed from everything else, if they do have it.

PRs

• https://github.com/silverstripe/module-standardiser/pull/40
• https://github.com/silverstripe/silverstripe-standards/pull/6
• https://github.com/silverstripe/markdown-php-codesniffer/pull/8
• https://github.com/silverstripe/gha-dispatch-ci/pull/11

[GuySartorelli]

PRs merged