fix(parser): improve diagnostics around modifier checks

[ulrichstark]

Follow up to #13368.
Closes #11713 by fixing five more cases mentioned in #11713 (comment).

Other changes:

• Added TS(1024) diagnostic
• Fixed the broken oxc-11713-13.ts test file
• Made TS(1070) not report redundantly if it's actually the responsibility of TS(1071)
• Branch off the more specific TS(1028) diagnostic from the general TS(1030) diagnostic like TypeScript does
• Remove incorrect code to parse modifiers on typescript this parameter

[Copilot]

Pull Request Overview

This pull request improves TypeScript parser diagnostics around modifier validation, addressing five specific cases from issue #11713. The changes focus on providing more accurate error messages for invalid modifier usage and fixing redundant diagnostic reporting.

• Enhanced modifier validation for method signatures, index signatures, and class elements
• Added new TS(1024) diagnostic for modifiers that can only appear on property declarations or index signatures
• Generalized the TS(1029) diagnostic to handle various modifier ordering issues beyond just export/declare

Reviewed Changes

Copilot reviewed 5 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/oxc_parser/src/ts/types.rs	Added readonly modifier validation for method signatures and removed redundant index signature validation
crates/oxc_parser/src/ts/statement.rs	Moved index signature modifier validation earlier to avoid redundant error reporting
crates/oxc_parser/src/modifiers.rs	Generalized export/declare modifier ordering diagnostic
crates/oxc_parser/src/js/class.rs	Enhanced modifier validation for class index signatures and method declarations
crates/oxc_parser/src/diagnostics.rs	Added new TS(1024) diagnostic and generalized TS(1029) for modifier ordering

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #13526 will not alter performance

_{Comparing ulrichstark:improve-diagnostics-around-modifier-checks (ac3e7d8) with main (91759c6)}

Summary

✅ 37 untouched benchmarks

[Boshen]

Thank you for the nice work!