feat: same titles for sent email groups

[ihor-romaniuk]

Reopened Pull Request based on #205

Description

this PR proposes making the display of mail recipients the same for all places (checkbox labels, Send email alert modal, Scheduled emails table with View Modal, Email Task History)

Steps to reproduce

click on "Staff/Administrators" checkbox -> complete the form (subject, body) -> options:

• to see recipients titles in "Caution" modal, click on "Send email" button
• same if you schedule day and time and click on "Schedule email" button
  (in this modal you can see the difference between recipients titles and selected checkbox label)

-> click "Continue" button -> wait for the "Scheduled emails" table to load and also compare titles in "Send to" column

Screenshots before

Example with selected "Staff/Administrators"

Example with selected "All Learners"

Screenshots after

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.29%. Comparing base (10f906b) to head (b433bc7).
⚠️ Report is 45 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
+ Coverage   83.26%   84.29%   +1.03%     
==========================================
  Files          47       50       +3     
  Lines         693      707      +14     
  Branches      135      134       -1     
==========================================
+ Hits          577      596      +19     
+ Misses        116      111       -5     

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