Remove redundant 'string.Format()' calls

[glen-84]

Summary of the changes (Less than 80 chars)

• Remove redundant 'string.Format()' calls.

[Copilot]

Pull request overview

Removes redundant string.Format(...) usages in HotChocolate error construction by leveraging existing ErrorBuilder.SetMessage(format, args) overloads, and enforces this pattern via a ReSharper inspection severity.

Changes:

• Replace SetMessage(string.Format(...)) with SetMessage(format, args) in core throwing helpers.
• Replace SetMessage(string.Format(...)) with SetMessage(format, args) in ASP.NET Core pipeline error helper.
• Configure ReSharper to treat redundant string.Format calls as errors via .editorconfig.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/HotChocolate/Core/src/Types/Utilities/ThrowHelper.cs	Uses ErrorBuilder.SetMessage(format, arg) instead of pre-formatting the message.
src/HotChocolate/Core/src/Types/Execution/ThrowHelper.cs	Same simplification for the OneOfFieldMustBeNonNull error.
src/HotChocolate/AspNetCore/src/AspNetCore.Pipeline/Utilities/ErrorHelper.cs	Same simplification for the BatchSizeExceeded error.
.editorconfig	Elevates ReSharper “redundant string.Format call” highlighting to error to prevent regressions.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (404d7e9) to head (c6ea723).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9529   +/-   ##
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