[llvm] [Lit][NFC] Refactor shell environment functionality and in-process builtins from TestRunner.py into new modules (Reopened) (PR #177358)

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darker --check --diff -r origin/main...HEAD llvm/utils/lit/lit/InprocBuiltins.py llvm/utils/lit/lit/ShellEnvironment.py llvm/utils/lit/lit/TestRunner.py
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``````````diff
--- InprocBuiltins.py	2026-04-10 14:27:25.000000 +0000
+++ InprocBuiltins.py	2026-04-10 14:59:04.790908 +0000
@@ -14,11 +14,10 @@
     expand_glob_expressions,
     kIsWindows,
     processRedirects,
     updateEnv,
 )
-
 
 
 def executeBuiltinCd(cmd, shenv):
     """executeBuiltinCd - Change the current directory."""
     if len(cmd.args) != 2:

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https://github.com/llvm/llvm-project/pull/177358