Add Usercentrics CMP (cookie consent + GDPR compliance)

[isstuev]

Description and Related Issue(s)

resolves #3289

Proposed Changes

added NEXT_PUBLIC_USERCENTRICS_CONFIG variable to set usercentrics script src and ruleset id.

Additional Information

Usercentrics has manual and auto modes. Here we support manual mode (client who requested feature uses manual mode).

Usercentrics requires to set the exact website domain (or list of the domains) on their side, otherwise won't work. Also, at least one Data Processing Services should be added to ruleset. If empty, usercentrics treat any user selection as 'ALL_ACCEPTED'.

Also, there are 3 categories: essential, functional and marketing. In this PR, only marketing acceptance is supported (including 'accept all' case).

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request

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