feat: ability to turn off import durations collection

[hi-ogawa]

Description

Resolves #9216

Trying to optimize data size #9255 is difficult since the sheer data size is huge and scale by (the number of test files) x (the number of source files), so there should be an option to disable this.

Based on the testing hi-ogawa/vitest-9216-repro#1, entirely disabling the collection itself doesn't seem to have meaning performance impact. If disabled, the blob output size almost same as v3.1.4 (before import duration is introduced).

TBD

I'm not sure how this option should be considered together with #9141 (comment).

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commit: f571529

[hi-ogawa]

Superseded by #9401