gh: use shallow clones whenever possible (#2491)

* gh: use shallow clones whenever possible
* gh: reverted submodule checks
* gh: lint: joined linting scripts
* gh: renamed linter workflow
* check python linter output
* gh: reworked linter
* checking c linter
* gh: merged submodule check & lint
* gh: renamed step
* gh: removed redundant `submodules: false`

Co-authored-by: あく <alleteam@gmail.com>

fbt.cmd

@@ -5,9 +5,9 @@ set SCONS_EP=python -m SCons
 
 if [%FBT_NO_SYNC%] == [] (
     if exist ".git" (
-        git submodule update --init
+        git submodule update --init --depth 1
     ) else (
-        echo Not in a git repo, please clone with git clone --recursive
+        echo Not in a git repo, please clone with "git clone"
         exit /b 1
     )
 )