Add 5% ab test to test optimisation of sourcepoint config

[Jakeii]

What does this change?

Full details of the test available here https://github.com/guardian/csnx/pull/1507

[github-actions[bot]]

Deploy build 2136 of dotcom:frontend-all to CODE

All deployment options

- [Deploy build 2136 of `dotcom:frontend-all` to CODE](https://riffraff.gutools.co.uk/deployment/deployAgain?project=dotcom%3Afrontend-all&build=2136&stage=CODE&updateStrategy=MostlyHarmless&action=deploy) - [Deploy parts of build 2136 to CODE by previewing it first](https://riffraff.gutools.co.uk/preview/yaml?project=dotcom%3Afrontend-all&build=2136&stage=CODE&updateStrategy=MostlyHarmless) - [What's on CODE right now?](https://riffraff.gutools.co.uk/deployment/history?projectName=dotcom%3Afrontend-all&stage=CODE)

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From guardian/actions-riff-raff.

[prout-bot]

Seen on ADMIN-PROD (merged by @Jakeii 11 minutes and 5 seconds ago)

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[prout-bot]

Seen on FRONTS-PROD (merged by @Jakeii 13 minutes and 14 seconds ago)

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