[clang-tools-extra] [clang-tidy] Enhance modernize-use-starts-ends-with to handle substr patterns (PR #116033)

[Nicolas van Kempen via cfe-commits]

================
@@ -171,10 +171,24 @@ void UseStartsEndsWithCheck::registerMatchers(MatchFinder 
*Finder) {
                              hasRHS(lengthExprForStringNode("needle")))))
           .bind("expr"),
       this);
+      Finder->addMatcher(
----------------
nicovank wrote:

For consistency, let's add the comment describing pattern (and separate from 
above with one newline):
```suggestion

  // Case 6: X.substr(0, LEN(Y)) [!=]= Y -> starts_with.
  Finder->addMatcher(
```

https://github.com/llvm/llvm-project/pull/116033
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