chore(quantic): parallelize scratch org setup

[louis-bompart]

Cypress notwithstanding (it's about to be removed), analysis of the recent results shows that in the case of Headless changes, Quantic is the second bottleneck, with execution time in the worst-case scenario falling within the 15' range.

To alleviate this:

• chore(quantic): move playwright setup to docker #6167 will help; it will reduce the avg of setup time and bring back down the worst-case scenario where apt gets slow (in the worst-case scenario, apt dependencies alone were around 4-5', and I guestimate them to be in the 2-3' average)
• This PR: we noticed that the setup & teardown phase of Scratch Orgs was done sequentially.
• The setup phase has an average runtime of 11m15s over the last year, and most of it now is on the sfdx interactions. By parallelizing those two processes, we should have a bit less than ~50% improvement (ought to consider the base overhead). The experiment validates the theory:

• The gain for the teardown would be negligible: we see an avg run time <2min. We systematically need to have 1 to 2 min of setup (npm install and whatnot), so the gain should be in seconds. Recent runs validate this theory: https://github.com/coveo/ui-kit/actions/runs/18539880218/job/52846626897; if we parallelize the two teardown runs, we would save... 4 seconds.

All and all, #6167 combined with this PR could shave up to 10' in the worst-case scenario, and over 5' in average.

Data for Coveans:

• Performance query for the setup
• Performance query for the teardown

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KIT-5134

[developer-experience-bot]

Pull Request Report

PR Title

✅ Title follows the conventional commit spec.

Live demo links

• Storybook

• Playwright report

Bundle Size

File	Old (kb)	New (kb)	Change (%)
case-assist	255.6	255.6	0
commerce	369.4	369.4	0
search	427.1	427.1	0
insight	418.3	418.3	0
recommendation	266.4	266.4	0
ssr	421.5	421.5	0
ssr-commerce	386.5	386.5	0
ssr-commerce-next	387.8	387.8	0
ssr-next	422.1	422.1	0

[mmitiche]

Very nice, thank you! 🚀