perf: avoid fetchModule roundtrip if the module is cached

[sheremet-va]

Description

This has a noticeable effect (before/after):

   Duration  25.29s (transform 47.80s, setup 14.48s, collect 110.46s, tests 60.00s, environment 20.94s, prepare 452ms)
   Duration  22.11s (transform 18.42s, setup 16.63s, collect 79.83s, tests 54.14s, environment 24.67s, prepare 481ms)

We can avoid the roundtrip because if the module is invalidated, then we will destroy the worker, so we can be sure the module didn't change.

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