feat: Announcement feature flag per page

[novakzaballa]

Thanks for submitting a PR! Please check the boxes below:

• [x] I have run pre-commit to check linting
• [ ] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

• Now the UI can read a list of pages from the announcement_per_page feature flag and display the announcement only on those pages, this is the pages name list:

  login not-found signup home github-setup maintenance password-reset features change-requests scheduled-changes change-request scheduled-change widget invite invite-link broken oauth saml environment-settings sdk-keys integrations users user-id user create-environment project-settings-in-environment compare feature-history feature-history-detail project-settings permissions segments organisation-settings organisation-permissions organisation-usage organisation-settings-redirect organisation-projects account-settings audit-log organisations audit-log-item create-organisation project-redirect account

How did you test this code?

• Update the announcement_per_page FF with a new key named "pages", and add it the page names for example: ["segments", "users"]

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[matthewelwell]

@novakzaballa I think we discussed creating a different component for this. What made you change your mind? If we stick with the announcement feature, I think we want to consider a couple of extra things:

1. Should we allow the value to be a list as well as an object, and handle the typing in the code? This would be a bit ugly, but it would allow us flexibility in the future while maintaining backwards compatibility.
2. Should we add another new attribute which is e.g. "allow_dismiss" that we can set to false for announcements that we want to ensure are permanent?