feat(*): linting rules and fixes

[adamdehaven]

Summary

Adds eslint and stylelint rules to block the usage of Kongponents utility classes and CSS custom properties in Portal (as they will be removed in the next release).

TODO before merge

• Keep up-to-date with main
• Re-enable /.vscode/settings.json file
• Run yarn stylelint:fix
• Run yarn lint:fix
• Change the @kong/kongponents dependency to the alpha release (yarn add @kong/kongponents@alpha) once it is available (before merge)

---

After steps above are completed, this PR also includes:

• Add stylelint and associated rules (e.g. property order, etc.)
• Additional eslint rules to standardize the codebase (e.g. attribute order, trailing commas, etc.)
• Ran lint:fix and stylelint:fix to update the codebase to adhere to the new rules. Verified no breaking changes.
• Consolidates the .client.eslintrc.js and .eslintrc.js files as there was no reason for them to be separate
• Adds the typecheck into the pre-commit hook to prevent code being pushed that we already know will fail the CI
• Adds the stylelint check to the CI pipelines
• Adds @kong/design-tokens package and auto-injects the SCSS variables into all components to utilize as needed

---

Existing codebases/forks/etc. can run the following commands to ensure their custom code adheres to the new rules:

# Get latest from main branch, then...

yarn install --frozen-lockfile

yarn stylelint:fix

yarn lint:fix

[nateslo]

@adamdehaven can we close this PR?

[adamdehaven]

@nateslo if we're thinking none of this matters until 🤫 sure; your call 👍