Rename phpcs.xml.dist to phpcs.xml in preparation for GitLabCI

First the MR with no change to show the baseline current state of the jobs.

Baseline phpcs job https://git.drupalcode.org/project/scheduler/-/jobs/46080 shows the current failures
Also images stored on #3357870: The PHPCS job overwrites the projects own phpcs.xml.dist file →

The Gitlab pipeline PHPCS job for the branch is https://git.drupalcode.org/project/scheduler/-/jobs/46080
It fails on two sniffs, with errors

 284 | WARNING | [x] There must be no blank line following an inline
     |         |     comment (Drupal.Commenting.InlineComment.SpacingAfter)

and

 873 | ERROR   | [ ] The array declaration extends to column 91 (the limit is
      |         |     80). The array content should be split up over multiple
      |         |     lines (Drupal.Arrays.Array.LongLineDeclaration)

The PHPCS job for this MR is https://git.drupalcode.org/project/scheduler/-/jobs/46086 and it passes

Test failures are unrelated to this issue. See 📌 SchedulerRulesEventsTest fail with "Indirect modification of overloaded property ... has no effect" Active

Renaming should not cause a big problem. Better to do this now before 2.0 release
Will also backport to 8.x-1.x to keep both branches aligned.

Automatically closed - issue fixed for 2 weeks with no activity.