Remove lgtm.yaml

[mspang]

Problem

We're no longer using lgtm.com but have a configuration file for it.

Summary of Changes

Delete lgtm.yaml

[github-actions]

Size increase report for "esp32-example-build"

File	Section	File	VM
chip-wifi-echo.elf	.flash.rodata	12	12
chip-wifi-echo.elf	.dram0.bss	0	8
chip-wifi-echo.elf	.dram0.data	8	8
chip-wifi-echo.elf	.flash.text	-84	-84

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-wifi-echo.elf and ./pull_artifact/chip-wifi-echo.elf:

sections,vmsize,filesize
.flash.rodata,12,12
.dram0.bss,8,0
.dram0.data,8,8
.debug_loc,0,-4
[Unmapped],0,-20
.flash.text,-84,-84

[andy31415]

I am very puzzled about our bloat checker - how in the world would this PR change flash/rodata size. I wonder if our builds are really reproducible or we properly detect where we branch off master.