feat: adding a new plugin for the enterprise modal on dashboard (take 2)

[kiram15]

Verizon requested that the modal that attempts to direct learners to the enterprise dashboard have to be either accepted or dismissed instead of being able to click out of it.

This is part of 3 different PRs that extract the enterprise modal into a plugin.

https://github.com/edx/edx-internal/pull/12452
https://github.com/edx/frontend-plugin-learner-dashboard/pull/73

Jira Ticket - ENT-9853

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.44%. Comparing base (dd4f61e) to head (40ed336).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #582      +/-   ##
==========================================
+ Coverage   97.36%   97.44%   +0.08%     
==========================================
  Files         155      152       -3     
  Lines        1365     1330      -35     
  Branches      228      225       -3     
==========================================
- Hits         1329     1296      -33     
+ Misses         34       33       -1     
+ Partials        2        1       -1     

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[jsnwesson]

LGTM!