Merge pull request #81874 from bakneko/remove-lgtm

Remove lgtm.yml since LGTM is now replaced by Github Code Scanning

.lgtm.yml

@@ -1,7 +0,0 @@
-extraction:
-  cpp:
-    after_prepare:
-      - pip3 install scons
-      - PATH="/opt/work/.local/bin:$PATH"
-    index:
-      build_command: scons -j2