Consider .test.{js|ts|gjs|gts} as a test file pattern

[lego-technix]

Hello 👋 could you consider .test too as a valid test file pattern?

👀 This PR is similar to #2157, but for the .test test file pattern.

The rationale

.test.js is a widely used test file pattern:

• it’s used by CLI tools like Jest (cf. https://jestjs.io/docs/getting-started), Vitest (https://vitest.dev/guide/), TAP (cf. https://node-tap.org/cli/), etc.
• it’s recognized by IDEs like VSCode see the following screenshot where .test.js files (colored in brown) are specifically differentiated from other "source" files (colored in some shade of yellow):

Concrete benefit (for the world 😁)

For example that would make possible to use the .test.js test file pattern for all the code of the https://github.com/1024pix/pix/ big monorepo which contains both Backend code and Ember Frontend code.

[NullVoxPopuli]

seems good to me!

[lego-technix]

Thank you @NullVoxPopuli ❤️