📎 noUndeclaredVariables: set checkTypes to false by default

[Conaclos]

Description

As cited by our last changelog:

• noUndeclaredVariables now provides the checkTypes option (#3998).

  noUndeclaredVariables is inspired by the no-undef ESLint rule. It reports all references that are not bound to any declarations within a module.
  Node.js, JavaScript and TypeScript globals are ignored.
  Biome provides the javascript.globals option to list additional globals that should be ignored by the rule.

  In TypeScript projects, developers often use global declaration files to declare global types.
  Biome is currently unable to detect these global types.
  This creates many false positives for noUndeclaredVariables.

  TypeScript is better suited to perform this kind of check.
  As proof of this, TypeScript ESLint doesn't provide any rule that extends the no-undef ESLint rule.

  This is why we introduce today a new option checkTypes which, when it is set to false, ignores undeclared type references.
  Given the following configuration...

  {
      "linter": {
          "rules": {
              "correctness": {
                  "noUndeclaredVariables": {
                      "level": "error",
                      "options": { "checkTypes": false }
                  }
              }
          }
      }
  }

  ... UndeclaredType is not reported by the rule.

  export default function(): UndeclaredType {}

  We plan to turn off the option by default in Biome 2.0
  Also, this will bring the Biome rule closer to the no-undef ESLint rule.