🐛 Source Google Analytics Data API: Add CohortSpec to custom report in specification

[artem1205]

What

Resolve

• Source Google Analytics 4: Custom reports missing CohortSpec #33799
• https://github.com/airbytehq/oncall/issues/3776

How

• Add CohortSpec to custom report in specification
• update docs

Recommended reading order

1. spec.json

🚨 User Impact 🚨

no breaking changes

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[github-actions]

Warning

🚨 Connector code freeze is in effect until 2024-01-02. This PR is changing connector code. Please contact the current OC engineers if you want to merge this change to master.

[github-actions]

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[artem1205]

UI issue:

Cohorts should be shown separately, as described in schema.

Moving to on hold

UPDATE: used "oneOf" statement for better UX and overcome current rendering limitations.