Fix ESM TS config loading in a CJS project

[phryneas]

Summary

This would fix #15682 where ESM in a .ts config file in a type: "commonjs" would error.

This has some alternatives:

• what this PR does
• going further than this PR and retrying to run loadTSConfigFile after any error, without rethrowing (this would change error messages for some of the other tests with invalid syntax)
• not solving this and instead encourage people to rename their jest.config.ts to jest.config.mts, which should even work in a CommonJS project without any code changes on jest's side

Please make a call here - I don't have a strong opinion either way :)

Test plan

I added a test.

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commit: 55f554e

[cpojer]

Looks good aber Sätze beginnt man immer noch mit Großbuchstaben.

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