More ubuntu tests

[camillobruni]

• Run Firefox and Chrome browse tests in headless mode on ubuntu
• Shared common setup steps with yaml anchors to avoid bugs

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[danleh]

I suppose that's because there are fewer resource limits on Ubuntu images vs. MacOS, is it? Are we running into these limits or timeouts often (in other words: is this an actual problem)? If we are, LGTM. If we are not, having all three engines run on similar hardware is a somewhat nice rough comparison/smoke test.

[camillobruni]

I just ran into this issue today that we mac jobs were just not scheduled.
What I could do is only run the default suites + Safari tests on macs and then the rest is on linux machines.

[kmiller68]

What I could do is only run the default suites + Safari tests on macs and then the rest is on linux machines.

We can certainly run jsc CLI tests on Linux. It's essentially identical to our X86_64 Mac implementation, modulo a different ICU CLDR dataset but that shouldn't matter for JetStream.