Add sitemap.xml

[BUGFIX] Add sitemap.xml -> yoast-snippetpreview
5 jobs for 498-https-typo3-org-sitemap-xml-does-not-exist in 4 minutes and 8 seconds (queued for 1 second)
Name Stage Failure
failed
test:typoscript Test
  56 Expected indent of 10 spaces.
57 Expected indent of 8 spaces.
60 Expected indent of 6 spaces.
61 Expected indent of 4 spaces.
62 Expected indent of 2 spaces.

SUMMARY
59 issues in total. (59 warnings)
ERROR: Job failed: exit code 1