feat: Add highcpu c3d and c4d test pool (mozilla-releng#602)

Initially will be used by xpcshell tests - it demands a lot more CPU than memory
These 2 pools will be temporary for benchmarking/before deciding which pool to use

Author: hneiva

worker-pools.yml

@@ -203,6 +203,10 @@ meta:
       - *scratch-disk
       - *scratch-disk
     machine_type: c3d-standard-60-lssd
+  - &c3d-highcpu-16
+    disks:
+      - *persistent-disk-75gb
+    machine_type: c3d-highcpu-16
   - &c4d-standard-4
     disks:
       - *persistent-disk-75gb
@@ -224,6 +228,10 @@ meta:
     disks:
       - *persistent-disk-75gb
     machine_type: c4d-highcpu-8
+  - &c4d-highcpu-16
+    disks:
+      - *persistent-disk-75gb
+    machine_type: c4d-highcpu-16
 
 pools:
   - pool_id: infra/build-decision
@@ -3196,6 +3204,12 @@ pools:
       - pool-group: gecko-t
         suffix: -noscratch
         instance_types: [*c3d-standard-8]
+      - pool-group: gecko-t
+        suffix: -16c30gbc4d
+        instance_types: [*c4d-highcpu-16]
+      - pool-group: gecko-t
+        suffix: -16c32gbc3d
+        instance_types: [*c3d-highcpu-16]
       - pool-group: comm-t
         suffix: -noscratch
         instance_types: [*c3d-standard-8]