Merge pull request #25 from morvans/protect-config_sync_directory

Set $settings['config_sync_directory'] only if it's empty.

Merge pull request #26 from pantheon-systems/protect-config_sync_dire…

…ctory_9.x

Set $settings['config_sync_directory'] only if it's empty

Merge pull request #27 from pantheon-systems/protect-config_sync_dire…

…ctory_8.x

8.x: Set $settings['config_sync_directory'] only if it's empty

Ignore settings.pantheon.php from PHP Code Sniffer

Alternatively, we could fix the sniff violations, but it's pretty common to just ignore settings files. Before this change, the same can be accomplished with these lines in `phpcs.xml`:
```xml
    <!-- Ignore scaffolded Pantheon settings file. -->
    <exclude-pattern>web/sites/default/settings.pantheon.php</exclude-pattern>
```
but it's better to have it taken care of upstream :) thank you! 🙏🏻

Ignore settings.pantheon.php from PHP Code Sniffer

Ignore settings.pantheon.php from PHP Code Sniffer

Alternatively, we could fix the sniff violations, but it's pretty common to just ignore settings files. Before this change, the same can be accomplished with these lines in `phpcs.xml`:
```xml
    <!-- Ignore scaffolded Pantheon settings file. -->
    <exclude-pattern>web/sites/default/settings.pantheon.php</exclude-pattern>
```
but it's better to have it taken care of upstream :) thank you! 🙏🏻

Drupal integrations 10.x is only for Drupal ^10

Adds logic to prevent redirection to install.php on test/live.

Adds logic to prevent redirection on stage/live sites to install.php.

Update conflict: only allow this branch to work with Drupal 9+