refactor(language_server): remove ServerLinterDiagnostics

[Sysix]

This PR refactors the diagnostic storage mechanism in the ServerLinter by removing the intermediate ServerLinterDiagnostics wrapper struct and directly using Arc to store diagnostics.

[Sysix]

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• feat(language_server): respect disable directives for type-aware rules #15170
• refactor(language_server): remove ServerLinterDiagnostics #15169 👈 (View in Graphite)
• refactor(language_server): Backend checks the correct LintOptions::Run #15166
• refactor(language_server): use LintRunner #14472
• refactor(language_server): send in memory source text to tsgolint #14733
• main

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[Copilot]

Pull Request Overview

This PR refactors the diagnostic storage mechanism in the ServerLinter by removing the intermediate ServerLinterDiagnostics wrapper struct and directly using Arc<ConcurrentHashMap> to store diagnostics.

• Removed the ServerLinterDiagnostics struct and its associated methods
• Simplified diagnostic access by directly interacting with the ConcurrentHashMap
• Removed the corresponding unit test that was testing the removed ServerLinterDiagnostics struct

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