Send only one email every 15 minutes for new clusters

[ujh]

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[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 70.10%. Comparing base (1697db4) to head (59202d7).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
app/workers/check_new_clusters.rb	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2597      +/-   ##
==========================================
- Coverage   70.14%   70.10%   -0.05%     
==========================================
  Files         284      285       +1     
  Lines        4710     4717       +7     
  Branches      173      173              
==========================================
+ Hits         3304     3307       +3     
- Misses       1388     1392       +4     
  Partials       18       18              

Flag	Coverage Δ
javascript	44.14% <ø> (ø)
ruby	85.06% <55.55%> (-0.10%)	⬇️

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