39dde5bb9a4d4901b0449d2f876524e1af0266d7
mac_unopt orchestrator builder to Linux (flutter/engine#41184)
`mac_unopt` orchestrator kicks off Mac swarming tasks, but don't seem to need to run on a Mac. Swap Linux bots which are more plentiful and have a shorter queue time.
Start by adding new `bringup` builder to see if it passes in staging. If it passes I will remove the Mac variant ASAP.
Led run: 49f579a163/+/build.proto
Keep `mac_ios_engine` and `mac_host_engine` as Macs since they need to run Xcodes on Macs to create the xcframeworks.
See also https://github.com/flutter/engine/pull/41181 and https://github.com/flutter/engine/pull/41210
Description
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