Update eslint to 9 and add jsdoc plugin

[Wendy Fouchter (Wendystraite)]

Description of the change

• Update eslint from 8 to 9.
• Migrate the old config to the new eslint flat configs
• Add eslint-plugin-jsdoc to check jsdoc validity and prevent false positives of "no-unused-vars" when importing a type only for jsdoc.
• Fix all new errors and warnings
• Fix "ComponentScope.test.tsx" that didn't check for React strict mode

See https://eslint.org/docs/latest/use/migrate-to-9.0.0

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation or Development tools (readme, specs, tests, code formatting)

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Latest commit: 3ff51dd

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[Copilot]

Pull Request Overview

This pull request updates ESLint from version 8 to 9 and migrates to the new flat configuration format. The update also adds the eslint-plugin-jsdoc to improve JSDoc validation and prevent false positives for type imports used only in documentation.

• Upgrade ESLint to v9 with flat config migration
• Add JSDoc linting with eslint-plugin-jsdoc
• Fix all new ESLint errors and warnings across the codebase

Reviewed Changes

Copilot reviewed 27 out of 28 changed files in this pull request and generated 1 comment.

File	Description
package.json	Update ESLint and TypeScript-ESLint to latest versions, add JSDoc plugin
eslint.config.mjs	New flat ESLint configuration replacing .eslintrc.json
.eslintrc.json	Remove old ESLint configuration file
Multiple TypeScript files	Fix linting errors including variable declarations, type usage, and JSDoc issues

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[Logan Volkers (loganvolkers)]

Wendy Fouchter (@Wendystraite) please update your PR on top of main to resolve merge conflicts.