feat: drain jobs of 'Null' dest type

[Sidddddarth]

Description

Drain jobs of Null destType. destType introduced for convenience. Allows events to enjoy all features upto user transformation(including). Router transformations are obviously not allowed for these events.

Linear Ticket

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.78%. Comparing base (9683021) to head (5599376).
Report is 84 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5207      +/-   ##
==========================================
+ Coverage   74.71%   76.78%   +2.06%     
==========================================
  Files         417      439      +22     
  Lines       49913    65383   +15470     
==========================================
+ Hits        37294    50202   +12908     
- Misses      10199    12712    +2513     
- Partials     2420     2469      +49     

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[github-actions]

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