Revert "[llvm-lit] Process ANSI color codes in test output when formatting" (#108104)

Reverts llvm/llvm-project#106776 because of a test failure on Windows.

Author: hnrklssn

lit/TestRunner.py

@@ -1017,20 +1017,6 @@ def _executeShCmd(cmd, shenv, results, timeoutHelper):
     return exitCode
 
 
-def findColor(line, curr_color):
-    start = line.rfind("\33[")
-    if start == -1:
-        return curr_color
-    end = line.find("m", start+2)
-    if end == -1:
-        return curr_color
-    match = line[start:end+1]
-    # "\33[0m" means "reset all formatting". Sometimes the 0 is skipped.
-    if match == "\33[m" or match == "\33[0m":
-        return None
-    return match
-
-
 def formatOutput(title, data, limit=None):
     if not data.strip():
         return ""
@@ -1041,18 +1027,8 @@ def formatOutput(title, data, limit=None):
         msg = ""
     ndashes = 30
     # fmt: off
-    out = f"# .---{title}{'-' * (ndashes - 4 - len(title))}\n"
-    curr_color = None
-    for line in data.splitlines():
-        if curr_color:
-            out += "\33[0m"
-        out += "# | "
-        if curr_color:
-            out += curr_color
-        out += line + "\n"
-        curr_color = findColor(line, curr_color)
-    if curr_color:
-        out += "\33[0m"  # prevent unterminated formatting from leaking
+    out =  f"# .---{title}{'-' * (ndashes - 4 - len(title))}\n"
+    out += f"# | " + "\n# | ".join(data.splitlines()) + "\n"
     out += f"# `---{msg}{'-' * (ndashes - 4 - len(msg))}\n"
     # fmt: on
     return out