[clang] [llvm] [WIP][GitHub][CI] Add running of dump_ast_matchers.py to premerge workflow (PR #165472)

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<summary>
You can test this locally with the following command:
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``````````bash
darker --check --diff -r origin/main...HEAD llvm/utils/git/code-format-helper.py
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from darker here.
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``````````diff
--- code-format-helper.py	2025-10-28 20:39:06.000000 +0000
+++ code-format-helper.py	2025-10-28 20:40:24.212537 +0000
@@ -497,12 +497,16 @@
         if args.verbose:
             print(f"=== Debug: DumpASTMatchersHelper ===")
             print(f"Current working directory: {os.getcwd()}")
             print(f"Script directory: {self.script_dir}")
             print(f"Script name: {self.script_name}")
-            print(f"Script full path: {os.path.join(self.script_dir, self.script_name)}")
-            print(f"Script exists: {os.path.exists(os.path.join(self.script_dir, self.script_name))}")
+            print(
+                f"Script full path: {os.path.join(self.script_dir, self.script_name)}"
+            )
+            print(
+                f"Script exists: {os.path.exists(os.path.join(self.script_dir, self.script_name))}"
+            )
             print(f"Output HTML path: {self.output_html}")
             print(f"Output HTML exists: {os.path.exists(self.output_html)}")
 
         # Verify the input file exists
         matchers_header = "clang/include/clang/ASTMatchers/ASTMatchers.h"
@@ -554,18 +558,22 @@
         )
 
         if args.verbose:
             print(f"Git diff exit code: {proc.returncode}")
             if proc.returncode != 0:
-                print(f"Output HTML was modified (diff length: {len(proc.stdout)} chars)")
+                print(
+                    f"Output HTML was modified (diff length: {len(proc.stdout)} chars)"
+                )
             else:
                 print(f"Output HTML was NOT modified - check passed!")
 
         # 'LibASTMatchersReference.html' was modified - count as failure
         if proc.returncode != 0:
             if args.verbose:
-                print(f"error: {self.name} detected that {self.output_html} was modified")
+                print(
+                    f"error: {self.name} detected that {self.output_html} was modified"
+                )
                 print(f"This means the developer needs to run the script locally")
                 print(f"Diff preview (first 500 chars):\n{proc.stdout[:500]}")
             return proc.stdout
         else:
             return None

``````````

</details>


https://github.com/llvm/llvm-project/pull/165472