[clang] [DiagnosticInfo] Allow std::string_view in DiagnosticBuilder operator<<. (PR #190374)

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


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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions h -- clang/include/clang/Basic/Diagnostic.h --diff_from_common_commit
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Basic/Diagnostic.h b/clang/include/clang/Basic/Diagnostic.h
index c7c98c0a4..aa05f9d60 100644
--- a/clang/include/clang/Basic/Diagnostic.h
+++ b/clang/include/clang/Basic/Diagnostic.h
@@ -35,8 +35,8 @@
 #include <map>
 #include <memory>
 #include <optional>
-#include <string_view>
 #include <string>
+#include <string_view>
 #include <type_traits>
 #include <utility>
 #include <vector>

``````````

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https://github.com/llvm/llvm-project/pull/190374