fix: support custom test environment written in ESM with extension .ts and .mts

[ahnpnl]

Summary

Fixes kulshekhar/ts-jest#4195

Test plan

Added tests

Green CI

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commit: 51824da

[ahnpnl]

Hi @SimenB @cpojer would you please help me to take a look? Thank you

Regarding to the CI fail tests, they are not related to my changes and they are handled by #15881