fix(register): exclude internal js files from compilation process

[fargito]

Hello,

I encountered an issue to upgrade a monorepo to @swc-node/register version 1.10.0. See the PR and the workflow run.

The issue was that a TS file imported a JS file from within the monorepo (from an internal package).

@swc-node/register propertly excluded plain JS file located in the node_modules folder from being sent to swc for compilation, however, the logic failed when the plain JS file was located outside of node_modules.

In my understanding, checking whether a file is located in node_modules is irrelevant. What matters is:

• if the file is a ts file, send it to swc, then pass the js result to node
• otherwise, return early and let node perform its resolve algorithm

This PR therefore reduces the check. It will only validate that the file is not a ts file in order to return early.

Also since I remove the check with the AVAILABLE_EXTENSION_PATTERN regex, it became unused so I deleted it. LMK if I should leave it there.

[fargito]

Ci is failing, and It looks legitimate. My change may be an issue if a typescript file is importing a js file, due to potential cjs/esm discrepancies. I will continue to investigate and edit the PR