deps: remove test-related GYP files

- Less files to maintain.
- We don't use them.
- We build with GN to run V8 tests.

Fixes: https://github.com/nodejs/node/issues/25095
Refs: https://github.com/nodejs/node/issues/25010

PR-URL: https://github.com/nodejs/node/pull/25097


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>