fix: re-enable vanilla and vue playwright tests and codesandbox

[travis]

In #530 I've disabled playwright tests for Vue and our codesandbox builds:

1. The Vue playwright tests are failing in test on something that seems like it should work, used to work, and works manually
2. The "vanilla-JS" playwright tests have been failing and disabled for quite some time now
3. The codesandbox builds seem to be failing because of a pnpm upgrade.

We should find time to get all of these working again, or break them out separately to fix.