fix: download csv button text for data tables

[jajjibhai008]

Description
Issues:

• Currently on Engagements, Completions, and Leaderboard tabs. The label for the CSV download button for the table is incorrect. All labels have the same text Download Enrollments CSV
• By default, Data Granularity is Daily which is not match with currently working analytics.
• Numbers on Stats are not compacting as per original analytics

Fix:

• we change the labels for each tab.

  • Engagements: Download Engagements CSV
  • Completions: Download Completions CSV
  • Leaderboard: Download Leaderboard CSV

• Set Week as the default granularity

• If the integer count is more than four then compact that number otherwise show it as is

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.78%. Comparing base (dfaa444) to head (01b37cb).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1345   +/-   ##
=======================================
  Coverage   85.78%   85.78%           
=======================================
  Files         598      598           
  Lines       13119    13121    +2     
  Branches     2732     2779   +47     
=======================================
+ Hits        11254    11256    +2     
+ Misses       1800     1799    -1     
- Partials       65       66    +1     

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