Run integration tests in parallel to speed up testing (#175)

* Remove a few direct DB insertions to prepare for parallel tests

* Revert "Remove a few direct DB insertions to prepare for parallel tests"

This reverts commit f8a3552ad8.

* Add rudimentary experiment of splitting tests into two chunks to make them faster

* Add missing tag

* Remove code that enforces that all goldens are used, since it is incompatible with how tests are currently split into chunks

* Lay out the framework for checking goldens being used across all test runs

* Fix missing brace

* Revert "Remove code that enforces that all goldens are used, since it is incompatible with how tests are currently split into chunks"

This reverts commit 06cc3eedbc.

* Add initial work towards checking that all goldens are used

* Delete incorrect and unreferenced matrix

* Upgrade actions/upload-artifact to see if that makes the download in the next job work

* Alternatively, try downloading the artifact by name

* Update golden checker to read all the golden artifacts

* Swap to using glob to enumerate all golden files, rather than hardcoding them

* Remove debugging commands

* Remove goldens that are actually used

* Remove another golden that is actually used

* Add more comprehensive support for test sharding

* Fix references to test shards and increase shard count

* Shard the fuzz test

* Add debug prints

* Mark additional tests for sharding

* Fix logic error that broke test sharding

* Remove debug print

* Fix incorrect logic with skipping the fuzz test

* Move sharding functions to testutils and add some comments

* Upgrade all setup-go actions to enable caching of deps

* Remove goldens that don't exist

* Remove new line

* Reduce delay

* Correct stage name

* Remove incorrect skip code from the first version of sharding

* Remove unused import

* Reduce number of test shards to match GitHub's limit of 5 concurrent macos jobs

* Use cask for installing homebrew to speed up github actions

* More cleanup for unused goldens

client/fuzz_test.go

@@ -141,6 +141,12 @@ func FuzzTestMultipleUsers(f *testing.F) {
 	if skipSlowTests() {
 		f.Skip("skipping slow tests")
 	}
+	if isShardedTestRun() {
+		if currentShardNumber() != 0 {
+			f.Skip("Skipping sharded test")
+		}
+	}
+
 	defer testutils.RunTestServer()()
 	// Format:
 	//   $Op = $Key;$Device|$Command\n