…) (#13792)

* Chore: Repro FileEnumerator exception with default args (refs #13789)

When `CLIEngine` instantiates `FileEnumerator`, it explicitly passes its
own `CascadingConfigArrayFactory` instance, which now includes values
for `builtInRules`, `loadRules`, `eslintRecommendedPath`, and
`eslintAllPath`. This is the only place that ESLint core instantiates
`FileEnumerator`, so core does not rely on the constructor's default
value for `configArrayFactory`.

After `CascadingConfigArrayFactory` was extracted into
`@eslint/eslintrc`, it no longer assumed values for
`eslintRecommendedPath` and `eslintAllPath`, which `CLIEngine` now
provides. If those values are not passed, as is the case with the
default `CascadingConfigArrayFactory` for `configArrayFactory`, file
enumeration will encounter the exception that was reported in #13789.

From the perspective of ESLint core, the default value for
`configArrayFactory` is dead code. However, even though `FileEnumerator`
is an undocumented API, it's called by `eslint-plugin-import`'s
`no-unused-modules` rule, which hits the exception reproduced by this
test.

* Fix: Pass internal config paths in FileEnumerator default (fixes #13789)

When `CLIEngine` instantiates `FileEnumerator`, it explicitly passes its
own `CascadingConfigArrayFactory` instance, which now includes values
for `builtInRules`, `loadRules`, `eslintRecommendedPath`, and
`eslintAllPath`. This is the only place that ESLint core instantiates
`FileEnumerator`, so core does not rely on the constructor's default
value for `configArrayFactory`.

After `CascadingConfigArrayFactory` was extracted into
`@eslint/eslintrc`, it no longer assumed values for
`eslintRecommendedPath` and `eslintAllPath`, which `CLIEngine` now
provides. If those values are not passed, as is the case with the
default `CascadingConfigArrayFactory` for `configArrayFactory`, file
enumeration will encounter the exception that was reported in #13789.

From the perspective of ESLint core, the default value for
`configArrayFactory` is dead code. However, even though `FileEnumerator`
is an undocumented API, it's called by `eslint-plugin-import`'s
`no-unused-modules` rule, which hits the exception reproduced by this
test.

#13794)

* Chore: Repro missing built-in rule validation (refs #13793)

The bulk of our tests for rule schemas are isolated unit tests of
`ConfigValidator`. This is a single test to be sure we actually run rule
schema validation end-to-end and prevent cases like #13793.

After I run a patch release of `@eslint/eslintrc`, I'll push a second
commit on this branch to bump the dependency version and fix the test.

* Upgrade: @eslint/eslintrc for rule validation (fixes #13793)