Add back missed FlowcellRunMetricsConnection check in statusdb

[aanil]

Validation on miarka.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 26.07%. Comparing base (bfee8cc) to head (8ec5c0a).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
taca/utils/statusdb.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #483   +/-   ##
=======================================
  Coverage   26.07%   26.07%           
=======================================
  Files          37       37           
  Lines        5510     5510           
=======================================
  Hits         1437     1437           
  Misses       4073     4073           

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