feat: adding a new plugin for the enterprise modal on dashboard

[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/12301
https://github.com/edx/frontend-plugin-learner-dashboard/pull/58

Jira Ticket - ENT-9853

[deborahgu]

@kiram15, could we rename this plugin slot to be more generally applicable to the open source project? For example, it seems like this would be able to hold any initial modal, and isn't specific to enterprise. Is that right? It's just that we are using this slot for a modal that appears on first load to be the redirector for the Enterprise dashboard.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.44%. Comparing base (93bd883) to head (6f3fd02).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #565      +/-   ##
==========================================
+ 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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[adamstankiewicz]

[consideration/thought question] Would it make sense to co-locate SelectSessionModal as the default modal within DashboardModalSlot? It could be a bit confusing to have default modals outside of DashboardModalSlot (e.g., when should a default dashboard modal be put in this modal-specific slot vs. outside the modal-specific slot?).

If intentional to keep default dashboard modals out of the DashboardModalSlot, perhaps DashboardModalSlot is renamed to DashboardCustomModalSlot to be explicit that its for custom modals, not default modals like SelectSessionModal.

[jsnwesson]

I was thinking it'd make sense to have the SelectSessionModal as the default content as well, and it received some agreement during the most recent Frontend Working Group meeting.

[kiram15]

Because we have a customer waiting upon this change, I think this would be a good idea to accomplish as a fast-follow