Send experiment information to ContentScopeScripts

[CrisBarreiro]

Task/Issue URL: https://app.asana.com/1/137249556945/task/1209843378625805

Description

Send experiment information along with user cohorts to C-S-S

Steps to test this PR

Check all tests pass. #6236 adds an integration test that verifies the information on the C-S-S side

UI changes

n/a

[CrisBarreiro]

• #6234 : 2 dependent PRs (#6235 , #6316 ) 👈 (View in Graphite)
• develop

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