Clone ansi-test in the test stage instead of install.

Then the install stage doesn't need to save the ansi-test directory,
which isn't used until the test stage anyway.
8 jobs for rtoy-refactor-ci-config in 20 minutes and 51 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Install
passed #4341
linux
linux:install

00:00:42

passed #4342
osx
osx:install

00:00:46

 
  Build
passed #4343
linux
linux:build

00:04:08

passed #4344
osx
osx:build

00:10:20

 
  Test
passed #4345
linux
linux:test

00:02:12

passed #4346
osx
osx:test

00:04:57

 
  Benchmark
passed #4347
linux
linux:benchmark

00:02:40

passed #4348
osx
osx:benchmark

00:04:46