Fixed issues with duplicates during spamming form submit

[ihor-palii]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.43%. Comparing base (46b548f) to head (b57ca2e).
Report is 11 commits behind head on dev/7.0.

Files with missing lines	Patch %	Lines
temba/triggers/types.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           dev/7.0     #413   +/-   ##
========================================
  Coverage    88.43%   88.43%           
========================================
  Files          662      662           
  Lines        34916    34916           
========================================
  Hits         30877    30877           
  Misses        4039     4039           

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