If CI is set and CAPYBARA_DRIVER is not, use remote chrome

[smudge]

Summary

A minor compatibility update to support default behavior on other build systems. We'll still use selenium_chrome_headless in GitHub CI, but will default to selenium_remote_chrome in other build systems.

/domain @Betterment/test_track_core @kelvin-acosta /no-platform

[nanda-prbot]

Needs somebody from @Betterment/test_track_core and @kelvin-acosta to claim domain review

Use the shovel operator to claim, e.g.:

@myname << domain && platform

_{HOW TO: Claim a Review}

[kelvin-acosta]

<< domainLGTM

[nanda-prbot]

Review by @kelvin-acosta isn't sufficient because they don't have write access. This PR requires domain review from a collaborator with write access to the repo.

[kelvin-acosta]

<< domainLGTM