fix: esm loader fix

[Bayheck]

Purpose

Starting from Node version 20 Hooks like load run in a separate thread, isolated from the main thread.
https://nodejs.org/docs/latest-v20.x/api/module.html#hooks.

Our current implementation relies on main thread in getTestFileCompilers.
Because the load hook is now running in a separate thread the testFileCompilers was never initialized before, and getTestFileCompilers calls initTestFileCompilers with no parameters. That is why the esm flag is lost in Node version 20 and above.

Approach

Pass the esm flag from load hook to getTestFileCompilers` in order to initialize the correct compilers.

The test 'Should import ESM without errors in ESM mode' also works for this fix in node 20 and above.

References

closes #8132

Pre-Merge TODO

• Write tests for your proposed changes
• Make sure that existing tests do not fail