test - running tests with timing also needs to be configured with v8-flags.

[cderv]

This follows #9749 fix

We missed a spot which broke the timing of tests since then.

This should fix it. Let's see !

I'll run the timing on this PR too

[cderv]

Triggered at https://github.com/quarto-dev/quarto-cli/actions/runs/9488371177

[cderv]

All good ! So merging.

We should have a new file with test timing soon;