refactor: allow editing of ANONYMOUS_SURVEY_REPORT from env tokens

[Alec4r]

Description:

This PR adds the code that allows editing the value of the setting ANONYMOUS_SURVEY_REPORT from ENV_TOKENS.

This setting was added in previous PR https://github.com/openedx/edx-platform/pull/31431/files#diff-80e29d8214ecf239b743e73eaefccf89fbea558f97626cbbc817c5002d2b64fdR678

ISSUE:
openedx/axim-engineering#349

APPROVED DESIGN:
https://docs.google.com/document/d/1tm1O5BQsAwekphI5IN9pBn8behQDZigXePLGqCl5he8

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[felipemontoya]

Thank you for this fix @Alec4r.

This is good to be merged.

[MaferMazu]

Looks good to me.

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[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.