[clang] [Clang] Defaults `-Wunicode-whitespace` to an error. (PR #210945)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/lib/Lex/Lexer.cpp clang/test/Lexer/unicode.c --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Lex/Lexer.cpp b/clang/lib/Lex/Lexer.cpp
index 40a29ee56..a1f7ae416 100644
--- a/clang/lib/Lex/Lexer.cpp
+++ b/clang/lib/Lex/Lexer.cpp
@@ -3778,8 +3778,8 @@ bool Lexer::CheckUnicodeWhitespace(Token &Result, uint32_t C,
   if (!isLexingRawMode() && !PP->isPreprocessedOutput() &&
       isUnicodeWhitespace(C)) {
     Diag(BufferPtr, diag::ext_unicode_whitespace)
-      << EscapeSingleCodepointForDiagnostic(C)
-      << makeCharRange(*this, BufferPtr, CurPtr);
+        << EscapeSingleCodepointForDiagnostic(C)
+        << makeCharRange(*this, BufferPtr, CurPtr);
 
     Result.setFlag(Token::LeadingSpace);
     return true;

``````````

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https://github.com/llvm/llvm-project/pull/210945