fix: Course mode is used to show the correct bulk email options

[Inferato]

Description

This is a backport MR to the master branch.

According to the chapter Sending Email Messages to Learners in Different Enrollment Tracks course can may more than one mode and instructor must have the ability to send the email for users in this modes.
Communication MFE had a hardcoded 2 modes for every course. Sometimes it lead to the error.

courseModes was added to courseMetadata to display real course email recipient options.

Related MR:

• edx-platform/master
• edx-platform/open-release/quince.master

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Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                      Coverage Diff                      @@
##             open-release/quince.master     #172   +/-   ##
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  Coverage                              ?   83.18%           
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  Files                                 ?       47           
  Lines                                 ?      690           
  Branches                              ?      135           
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  Hits                                  ?      574           
  Misses                                ?      116           
  Partials                              ?        0           

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[arbrandes]

Isn't this the same as #171?

[mariajgrimaldi]

@arbrandes: it looks like it, but this is the backport PR

[dyudyunov]

This PR should be closed in favor of #192. The only difference compared to the current PR is that I applied Adolfo's suggestions from the master PR

@mariajgrimaldi @arbrandes @cmltaWt0 FYI

[cmltaWt0]

Got it. Would you mind adding the same description to the new PR?
I will close this by the end of the day if there are no objections.

[dyudyunov]

Got it. Would you mind adding the same description to the new PR? I will close this by the end of the day if there are no objections.

Ok, but I would rather copy the description from the related master PR #191

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