[Multi-domain]: Multi-domain script is still injected when multi-domain is not used

[mjhenkes]

What would you like?

Multi-domain script is still injected when multi-domain is not used

Why is this needed?

We should not impact other tests if the experimental flag is off

Other

[cypress-bot]

The code for this is done in cypress-io/cypress#20752, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[cypress-bot]

Released in 9.6.0.

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