fix: validate insights before rendering analytics summary & improve error message

[mahamakifdar19]

Ticket:
https://2u-internal.atlassian.net/browse/ENT-8817

Description:
For test enterprises, there is incomplete data in analytics, which was causing the analytics-summary API to return a bad request error. A validation check has been added to ensure the Summarize Analytics button is only displayed for users with complete insights data, against which the analytics summary can be tailored.
Additionally, the error message has been improved to provide clearer information in case of any technical issues.

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 85.80%. Comparing base (fdc0a9a) to head (01d5fda).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1372   +/-   ##
=======================================
  Coverage   85.79%   85.80%           
=======================================
  Files         610      610           
  Lines       13429    13430    +1     
  Branches     2825     2826    +1     
=======================================
+ Hits        11522    11523    +1     
  Misses       1837     1837           
  Partials       70       70           

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