chore(logs): improve mongo and graphql logs

[neSpecc]

• Log every mongo request
• Log graphql operations
• Fix redundant "releases" call when event has no release
• Removed unused "deepMerge" util

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.03704% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.14%. Comparing base (0eced98) to head (81cc005).
⚠️ Report is 59 commits behind head on master.

Files with missing lines	Patch %	Lines
src/metrics/mongodb.ts	74.07%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #555      +/-   ##
==========================================
- Coverage   66.66%   61.14%   -5.53%     
==========================================
  Files          11       19       +8     
  Lines         174      471     +297     
  Branches       24       92      +68     
==========================================
+ Hits          116      288     +172     
- Misses         54      171     +117     
- Partials        4       12       +8     

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[fdtwd8vv45-sketch]

Looks good