Rollup supports a config array, which allows us to invoke
it just once. This also moves config-wrapper-sync.ts into the
main build step, which allows it to share code with the rest of
the CommonJS build, yielding a smaller bundle size.

Both @unflakable/cypress-plugin and @unflakable/jest-plugin include
exported TypeScript types. Since both packages depend on the internal
@unflakable/plugins-common package, we need to use rollup-plugin-dts to
be sure that the exported types don't refer to this unpublished package.

The Mocha reporter prints the test duration in either medium (33m)
or fast (90m) color, depending on the duration. This is a source of
flakiness unless the tests accept both.

Chrome is slow on Windows, and Electron fails randomly with opaque
errors.

The `debug` library only prints timestamped output when terminal colors
are disabled. We disable colors here so that we can better understand the
timing of failed test runs. Note that DEBUG_COLORS is still enabled for
the Jest tests that invoke the Cypress plugin integration tests, since
GitHub Actions lets us show timestamps for each line of that output even
if colors are enabled. However, output from individual test cases is
buffered and printed all at once in the event of a test failure, so the
buffered output needs to include timestamps if we want to understand
the timing within a single Cypress invocation.

This may improve performance due to
actions/runner-images#5166.

When a test times out, we call treeKill() on the Cypress process
tree, followed by rejecting the promise. However, killing the Cypress
process triggers the `exit` event callback, which causes us to resolve
the promise before we have a chance to reject it.