jenkins: add node-test-commit-pre

[maclover7]

All actions run before pending post-build-status-update job is run. My
thought is that node-test-commit sub jobs will curl from master, and
then pipe to bash.

[refack]

👍 even if we don't curl it in, it's great to have this in a visible place.

[mhdawson]

Instead of curl, my first thought would be that we'd clone the build repo at the start of each job and then can run the scripts directly.

Either way seems like a good first step for pulling some logic out of the jenkins config and into git where we can more easily track changes.

[maclover7]

Landed in 2e05d83

[refack]

I rolled the change back for node-test-commit-linux-linked it was failing to generate env.properties so job were failing. https://ci.nodejs.org/job/node-test-commit-linux-linked/295/nodes=ubuntu1604_sharedlibs_debug_x64/console

P.S. I was sure node-test-commit-linux-linked was not in the multijob 🤔 yet

[rvagg]

that's because I had some custom work in there for node-test-commit-linux-linked to solve a problem related to status posting, the addition and explanation is shown in this comment: nodejs/node#17151 (comment)

I could pull that into a separate script and we'd be back to status quo.

Re curl vs git I like the idea of using git cause there's a bunch more things we could pull into it, we could replace most (or all?) of our jenkins scripts with scripts in this repo if we did a clone first.