Feature/mpp 611/remove inpage feature flag

[Francois-Gomis]

Reason for change

Remove in page feature flag.

Linear task

Code changes

Remove

How to test

use a account without feature flag.

Checklist for authors and reviewers

• [x] The title of the PR uses business wording, not technical jargon, for the changelog readers to understand it
• [x] The PR implements the changes asked in the referenced task / issue
• [x] The automated tests are compliant with the testing strategy
• [x] The tests are relevant, and cover the corner/error cases, not only the happy path
• [x] You understand the impact of this PR on existing code/features
• [ ] The changes include adequate logging and Datadog traces
• [ ] Documentation is updated (API, developer documentation, ADR, Notion...)

Non applicable

[sonarcloud[bot]]

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