Explore adding a browser test matrix to CI for vello_hybrid browser testing

[ajakubowicz-canva]

Related PR: #1020

Currently CI browser testing is exclusively done on Chrome.
Should we add a browser matrix so multiple browsers are tested?

[xStrom]

What would the candidates be? Firefox, and Safari on macOS?

Probably not worth a whole matrix, but just sequentially after Chrome in the same job.