Remove event number in slug to fix HttpError migrating emails

[amakarudze]

Changes in this pull request:

• Add a try ... except block to the migrate_gmail_account(new_event, slug) function.
• Create the email if the except block if the try block fails.
• Add regex to the get_or_create_gmail(event_application, event) function to remove event numbering in the slug which is causing the HttpError: 404 not found causing email migration issues.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.26%. Comparing base (6a05d70) to head (d20737f).
Report is 46 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #954      +/-   ##
==========================================
+ Coverage   81.01%   81.26%   +0.25%     
==========================================
  Files          95       98       +3     
  Lines        2860     2941      +81     
  Branches      269      271       +2     
==========================================
+ Hits         2317     2390      +73     
- Misses        492      499       +7     
- Partials       51       52       +1     

see 16 files with indirect coverage changes

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