m/test/e2e: split out tests into subpackages

The end-to-end tests have grown large enough that they merit their own
test targets. To make this more Go-idiomatic, we split away the tests
not just int separate Bazel targets, but also Go packages.

We also add per-test resource requests for Bazel, including a new
resource kind (iops). This makes the tests more deterministic and allows
use to eg. use --runs_per_test=10 to deflake test logic without hitting
resource contention issues.

//metropolis/test/e2e/suites/core:core_test                              PASSED in 35.1s
  Stats over 10 runs: max = 35.1s, min = 26.6s, avg = 31.9s, dev = 2.6s
//metropolis/test/e2e/suites/ha:ha_test                                  PASSED in 114.6s
  Stats over 10 runs: max = 114.6s, min = 90.1s, avg = 100.9s, dev = 7.6s
//metropolis/test/e2e/suites/ha_cold:ha_cold_test                        PASSED in 67.8s
  Stats over 10 runs: max = 67.8s, min = 55.5s, avg = 62.0s, dev = 4.1s
//metropolis/test/e2e/suites/kubernetes:kubernetes_test                  PASSED in 80.9s
  Stats over 10 runs: max = 80.9s, min = 58.8s, avg = 68.6s, dev = 6.0s

Change-Id: I8f31e09f599fd90c9941e2b69f36789817fa90ce
Reviewed-on: https://review.monogon.dev/c/monogon/+/3086
Reviewed-by: Jan Schär <jan@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/test/launch/cluster/cluster.go b/metropolis/test/launch/cluster/cluster.go
index 522b2f1..b37f5b5 100644
--- a/metropolis/test/launch/cluster/cluster.go
+++ b/metropolis/test/launch/cluster/cluster.go
@@ -287,7 +287,7 @@
 	fwVarPath := filepath.Join(r.ld, "OVMF_VARS.fd")
 	storagePath := filepath.Join(r.ld, "image.img")
 	qemuArgs := []string{
-		"-machine", "q35", "-accel", "kvm", "-nographic", "-nodefaults", "-m", "4096",
+		"-machine", "q35", "-accel", "kvm", "-nographic", "-nodefaults", "-m", "2048",
 		"-cpu", "host", "-smp", "sockets=1,cpus=1,cores=2,threads=2,maxcpus=4",
 		"-drive", "if=pflash,format=raw,readonly=on,file=" + ovmfCodePath,
 		"-drive", "if=pflash,format=raw,file=" + fwVarPath,