Remove unreliable test for CDN
Tidy up some tests
Approve new style R2 ad units

R2 ad units will now have the same format as NextGen. However, the new
units must now be approved manually too.
Tighten ad unit filter to 4 segments

Domain/section/contenttype/platform
Add test data
Stop putting the old metrics
Remove the old latency metrics
Stray letter
Pass through the inline video player end slate path on fronts
Merge remote-tracking branch 'origin/master' into supportR2InAdUnitApprovalApp
Merge branch 'master' into supportR2InAdUnitApprovalApp
extend WorldCupWallchartEmbedSwitch, WorldCupArticleContainerSwitch
Merge pull request #5472 from guardian/extend-switches

Extend WorldCupWallchartEmbedSwitch, WorldCupArticleContainerSwitch
Merge pull request #5461 from guardian/supportR2InAdUnitApprovalApp

Support r2 in ad unit approval app
Merge pull request #5469 from guardian/use-correct-endslate-url

Pass through the inline video player end slate path on fronts
Do not show related component for children's book sites
Merge pull request #5474 from guardian/childrens-site-related

Do not show related component for children's book sites
Move object healthcheck to class for atomic health checking
run ab tests once
Duration metric test should await