Save enrollment action

[felipemontoya]

Note for reviewers: I took the original PR #111 from @ramadanomar and copied it here to be able to review and fix the remaining QA issues for merging

Description

Added the ability to save the preffered configuration values for 'openedx-enrollment-force' and 'openedx-enrollment-allowed'. This is needed to be able to enroll users that have no openedx account yet and/or enroll users to courses that have already started without manual intervation from an admin.

Without this, an admin will have to check failed enrollment requests and retry them from "openedx sync" tab in wordpress.

This would result in a really bad end user experience (purchase was made but access isn't given)

Useful information to include:

• Which user roles will this change impact? Operator

Screenshots

Checklist for Merge

• Tested in a remote environment
• Updated documentation
• Rebased master/main
• Squashed commits
• add changelog entry
• bump to v2.1.0

[openedx-webhooks]

Thanks for the pull request, @felipemontoya!

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[felipemontoya]

Apparently I did not need to create this PR and github does the update automatically.