Add tag-page-storylines ab test

[Georges-GNM]

What does this change?

Uses the new ab testing framework to support this test. Dependent on this frontend PR

Testing

• Deploy the frontend branch to code
• Verify that the current tag pages test is no longer active
• Deploy this branch to DCR code (including the ab testing project)
• Check that tag pages are showing as normal without being included in the test
• Opting in to the test should then display storylines content on selected page (for example, sport/formulaone)

[github-actions]

Deploy build 870 of dotcom:ab-testing to CODE

All deployment options

• Deploy build 870 of dotcom:ab-testing to CODE
• Deploy parts of build 870 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[github-actions]

Deploy build 25147 of dotcom:rendering-all to CODE

All deployment options

• Deploy build 25147 of dotcom:rendering-all to CODE
• Deploy parts of build 25147 to CODE by previewing it first
• What's on CODE right now?

---

From guardian/actions-riff-raff.

[gu-prout]

Seen on PROD (merged by @Georges-GNM 7 minutes and 51 seconds ago) Please check your changes!