[testUtils/esTestCluster] use more standard api style #13197
Merged
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#13099 added the esTestCluster test util, and used a somewhat strange API so that we could track state that wasn't "module level". That goal has already clashed with adding new features, and rather than keep down this road I think we should just track this tiny bit of state that is actually process specific at the module level.
The only impact this pr has on the rest of the code is that rather than calling
esTestCluster.use({ name: '...' })
code should callcreateEsTestCluster({ name: '...' })