Tidy up after migrating colymba/gridfield-bulk-editing-tools

[GuySartorelli]

The colymba/gridfield-bulk-editing-tools module has been moved to https://github.com/silverstripe/silverstripe-gridfield-bulk-editing-tools.

We have intentionally kept its old packagist/composer name.

There are some references to the old location (e.g. in the supported-modules repo), and also there's an old call for maintainers in the readme that we should remove.

Notes

• The creative-commoners fork has already been renamed from GridFieldBulkEditingTools to silverstripe-gridfield-bulk-editing-tools to match the silverstripe repo name
• The packagist references are still correct (e.g. supported modules link in the docs)

Acceptance Criteria

• Update the supported modules json https://github.com/silverstripe/supported-modules/blob/main/repositories.json
• Update any other references to the colymba/GridFieldBulkEditingTools (the old GitHub repo reference)
• Remove the call for maintainers from the readme

PRs

• FIX Update github reference to ex-colymba repo supported-modules#45
• MNT Update meta files after migrating repo to silverstripe org silverstripe-gridfield-bulk-editing-tools#311
• ENH Remove colymba from labels exclusion list module-standardiser#75
• MNT Update repos list github-issue-search-client#150

After merging, reassign to Guy to run module standardiser over the repo.

Module standardiser PRs

I also ran the labels and branch protection rule commands.

• MNT Run module-standardiser silverstripe-gridfield-bulk-editing-tools#312
• MNT Run module-standardiser silverstripe-gridfield-bulk-editing-tools#313