Removing Deprecated LGTM

[chayim]

The LGTM service is being shut off in two weeks. This pull request aims to remove all references to LGTM. Perhaps LGTM usage should be replaced with codeql, or a repository preferred tool, but IMHO that's the point of a different pull request.

[codecov-commenter]

Codecov Report

Base: 92.22% // Head: 92.20% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (7faa3e5) compared to base (c48dc83).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2473      +/-   ##
==========================================
- Coverage   92.22%   92.20%   -0.03%     
==========================================
  Files         113      113              
  Lines       29321    29321              
==========================================
- Hits        27042    27036       -6     
- Misses       2279     2285       +6     

Impacted Files	Coverage Δ
tests/test_asyncio/test_search.py	98.26% <0.00%> (-0.35%)	⬇️
tests/test_search.py	98.94% <0.00%> (-0.22%)	⬇️
tests/test_cluster.py	96.89% <0.00%> (-0.12%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.