TASK: Remove `createSitePackage` action

[mhsdesign]

Fixes https://github.com/neos/neos-development-collection/issues/4719

Triggering the creation of a composer package via Neos.SiteKickstarter from the web will be removed

See discussion regarding fragile GUI setups and the preferred use of cli instead: https://github.com/neos/neos-development-collection/issues/4243

Upgrade instructions

Review instructions

Checklist

• [ ] Code follows the PSR-2 coding style
• [ ] Tests have been created, run and adjusted as needed
• [ ] The PR is created against the lowest maintained branch
• [ ] Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• [ ] Reviewer - The first section explains the change briefly for change-logs
• [ ] Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[mhsdesign]

Related https://github.com/neos/neos-development-collection/pull/5136