This change is primarily about updating eslint from 8.x to 9.x but also includes a number of related changes to the linter configuration.

• Switch to the new eslint flat config format.
• Remove integration between eslint and prettier (per guidance from the Prettier team).
• Remove the @typescript-eslint/eslint-plugin and @typescript-eslint/parser plugins in favor of the new typescript-eslint package.
• Remove the unused eslint-plugin-jsonc package.
• Remove the eslint-plugin-github package. This package contains a lot of duplicate rules and prettier-related integration that we no longer want/need.

By removing the eslint-plugin-github package, the only rules we losing are those from the eslint-plugin-eslint-comments package (which is of minimal value) and the following GitHub-specific rules:

• array-foreach
• filenames-match-regex
• no-then