Add lock to run the contacts activities squash once

[norkans7]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 83.98%. Comparing base (2207ae9) to head (7ca4a84).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ureport/stats/tasks.py	0.00%	8 Missing ⚠️
ureport/polls/tasks.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1245      +/-   ##
==========================================
- Coverage   84.09%   83.98%   -0.11%     
==========================================
  Files          48       48              
  Lines        5858     5865       +7     
==========================================
  Hits         4926     4926              
- Misses        932      939       +7     

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