Move a few benchmarks from x64 Intel Macs to ARM (flutter#189377)

Most of the benchmarks will either run on ARM Macs-only, or run on
both ARM and x64 platforms. These 3 benchmarks currently only run on x64
Intel Macs (which we are
[deprecating](flutter#188328)). Move
them to ARM bots.

Generally we want to keep testing Intel Macs on beta and stable until
current master is released, but since these 3 benchmarks should have
been running on ARM, and they aren't testing anything
architecture-specific, I will cherry-pick these changes to stable and
beta.

This will unfortunately break the historical data for these benchmarks
and it will show up in skiaperf as new benchmarks.

The part of flutter#189144 that should
be cherry-picked to beta and stable.
Fixes flutter#188851 ("fixes")
Fixes flutter#189123 ("fixes")

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Author: jmagman

.ci.yaml

@@ -4808,9 +4808,10 @@ targets:
       task_name: hello_world_android__compile
 
   # mac mokey benchmark
-  - name: Mac_mokey hot_mode_dev_cycle__benchmark
+  - name: Mac_arm64_mokey hot_mode_dev_cycle__benchmark
     recipe: devicelab/devicelab_drone
     presubmit: false
+    bringup: true
     timeout: 60
     properties:
       tags: >
@@ -4848,9 +4849,10 @@ targets:
       task_name: integration_ui_frame_number
 
   # mac mokey benchmark
-  - name: Mac_mokey microbenchmarks
+  - name: Mac_arm64_mokey microbenchmarks
     recipe: devicelab/devicelab_drone
     presubmit: false
+    bringup: true
     timeout: 60
     properties:
       tags: >
@@ -5467,9 +5469,10 @@ targets:
         ["devicelab", "ios", "mac"]
       task_name: hot_mode_dev_cycle_ios__benchmark
 
-  - name: Mac_x64 hot_mode_dev_cycle_ios_simulator
+  - name: Mac_arm64 hot_mode_dev_cycle_ios_simulator
     recipe: devicelab/devicelab_drone
     presubmit: false
+    bringup: true
     timeout: 60
     properties:
       dependencies: >-