chore: upgrade to analyzer 8

[andrew-bekhiet-solid]

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[gemini-code-assist]

Summary of Changes

Hello @andrew-bekhiet-solid, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on upgrading the project's core dependencies, specifically the analyzer and custom_lint_builder packages, to their latest major versions. This upgrade required a comprehensive refactoring across the codebase to adapt to breaking API changes in the analyzer package, ensuring continued compatibility and leveraging new features for static analysis and lint reporting.

Highlights

• Dependency Upgrades: The analyzer package has been upgraded from version ^7.1.0 to ^8.4.0, and custom_lint_builder has been upgraded from ^0.7.1 to ^0.8.1.
• API Migration: Numerous references to deprecated analyzer API elements (e.g., element2, library2, name2, ErrorReporter, AnalysisError, ErrorSeverity) have been updated to their new counterparts (e.g., element, library, name, DiagnosticReporter, Diagnostic, DiagnosticSeverity).
• Fixes Implementation: The implementation of quick fixes for several lint rules has been updated to use Expando for associating diagnostic information with Diagnostic objects, aligning with the new analyzer API patterns.

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[gemini-code-assist]

Code Review

This pull request upgrades the analyzer package to version 8 and custom_lint_builder to version 0.8.1. The changes primarily consist of adapting the existing codebase to the breaking changes introduced in these new versions. The updates are thorough and correctly implemented, including migrating from deprecated APIs (like ErrorReporter to DiagnosticReporter and removing ...2/...3 suffixes from element properties) and adopting modern Dart features like pattern matching for improved code clarity. The overall quality of the migration is excellent.