Upgrade linting tooling to latest version

[jonkoops]

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Description

Upgrades the linting tooling (ESLint, Prettier, publint), and fixes the resulting warnings/errors. The ESlint configuration has been migrated to the new 'flat' configuration format required by ESLint v9. ESLint is now also separated from Prettier into different scripts, as recommended by the Prettier documentation on linter integration.

Prettier will now format all types of files known to it, and not just the

References

• https://eslint.org/docs/latest/
• https://typescript-eslint.io/getting-started/
• https://prettier.io/docs/integrating-with-linters
• https://prettier.io/docs/precommit
• https://github.com/lint-staged/lint-staged?tab=readme-ov-file#automatically-fix-code-style-with-prettier-for-any-format-prettier-supports