fix(node): classify required js files as commonjs by default (#34673)

Treat ambiguous project .js files loaded through require() as CommonJS
first unless the nearest package scope is explicitly "type": "module".
This matches Node behavior for files like Angular/Karma's karma.conf.js
in package scopes with no type field.

Add a regression spec for requiring a Karma-shaped config file from a
package with no type field, and update existing require-from-package
coverage for the new default while preserving extensionless CJS behavior
in "type": "module" packages.

Tests:
- deno run --allow-write --allow-read --allow-run --allow-net
./tools/format.js --check
- cargo fmt --check
- cargo check -p deno_resolver -p deno_node -p deno
- cargo build -p deno
- ./x test-spec tests/specs/node/import_cjs_file_no_ext_mjs_pkg
tests/specs/run/npm_pkg_requires_esm_js
tests/specs/node/require_js_package_no_type
- /Users/divy/orch-work/issue-399/target/debug/deno run -A main.js (from
tests/specs/run/npm_pkg_requires_esm_js)
- /Users/divy/orch-work/issue-399/target/debug/deno run main.mts (from
tests/specs/node/import_cjs_file_no_ext_mjs_pkg)
- /Users/divy/orch-work/issue-399/target/debug/deno run -A main.cjs
(from tests/specs/node/require_js_package_no_type)

Closes #27392
Closes denoland/divybot#399

Co-authored-by: divybot <divybot@users.noreply.github.com>
Co-authored-by: Divy Srivastava <me@littledivy.com>