Fix warning when `projectRoot` is not writable

[flotwig]

Current behavior

In this PR, Cypress was modified to allow running on a read-only filesystem: #7126

The behavior was changed to warn with the 'FOLDER_NOT_WRITABLE' message, instead of erroring out, if the root was unwriteable for videos/screenshots.

In this PR, the warning emit was removed: #18221

The error still exists in the code, but is not being properly emitted.

This regression went unnoticed for a long time because this system test was failing but was not visible due to a bug with snapshots not failing system tests, but now it exposes the failure: https://app.circleci.com/pipelines/github/cypress-io/cypress/24915/workflows/1af6c0d9-6858-4d67-89b2-31e25e49ad9e/jobs/930321

Desired behavior

Cypress should warn when running on a read-only filesystem.

Test code to reproduce

Unskip the test skipped in #16354 and run:

yarn workspace @internal/system-tests test non_root_read_only_fs_spec

Cypress Version

latest develop

Other

No response

[cypress-bot]

The code for this is done in cypress-io/cypress#18495, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[cypress-bot]

Released in 8.7.0.

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Cypress v8.7.0, please open a new issue.