test(wtr): run in multiple browsers and with API_VERSION=66

[wjhsf]

Details

This PR adds a CI run of the tests with API_VERSION=66 and updates the config to run in chrome, firefox, and safari. It also (hopefully) connects to saucelabs when run in CI. If the LEGACY_BROWSERS var is set in CI, then it runs slightly old chrome and safari (not that legacy, imo 🤷).

Does this pull request introduce a breaking change?

• 😮‍💨 No, it does not introduce a breaking change.
• 💔 Yes, it does introduce a breaking change.

Does this pull request introduce an observable change?

• 🤞 No, it does not introduce an observable change.
• 🔬 Yes, it does include an observable change.

GUS work item

[wjhsf]

/nucleus ingore --reason "PR isn't ready and I want to watch CI"

[salesforce-nucleus]

❌ Error Parsing Command

Unknown arguments: reason, ingore

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Unknown arguments: reason, ingore

[wjhsf]

/nucleus ignore --reason "PR isn't ready and I want to watch CI"