Glib Glugovskiy

fix: reduce cache timeot value to comply with usecase

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## Description This PR reduces the default timeout value for caching of the users count on gradebook to 10 minutes, and also drops a cache key on enrollment status change,...

docs: test configuration without pip install for directory

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Builds are still failing, work on the issue - https://github.com/openedx/credentials/issues/2577

"Read the Docs" build is failing

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[The latest successful build](https://app.readthedocs.org/projects/edx-credentials/builds/?version__slug=&state=succeeded&version__type=): `Mon, Oct 16, 2023 10:00 AM` ### Reason: ``` Config validation error in build.os. Value build not found. ``` Failed build example: https://app.readthedocs.org/projects/edx-credentials/builds/25604990/ ### Traceback: ```...