ensure tests don't run when ACTUALLY cross-compiling #1006

Job	Run time
Clean up previous branch jobs	6s
Package builder app	5s
Unit Tests	6s
Sanity Test (ubuntu-22.04)	2m 4s
Sanity Test (macos-13)	2m 35s
Sanity Test (macos-14)	1m 48s
Sanity Test (windows-2022)	3m 27s
compilers (clang-9)	53s
aws-c-cal (manylinux1-x86)	2m 34s
compilers (clang-10)	41s
cross_compile (linux-armv6)	10m 31s
compilers (clang-11)	47s
aws-c-cal (manylinux1-x64)	2m 26s
cross_compile (linux-armv7)	11m 3s
compilers (gcc-7)	36s
aws-c-cal (manylinux2014-x86)	2m 44s
cross_compile (linux-armv8)	7m 40s
compilers (gcc-8)	36s
aws-c-cal (manylinux2014-x64)	2m 37s
downstream (aws-c-mqtt)	12m 16s
compilers (gcc-9)	37s
aws-c-cal (manylinux2014-aarch64)	24m 13s
aws-c-cal (musllinux-1-1-aarch64)	28m 18s
downstream (aws-c-http)	4m 35s
compilers (gcc-10)	33s
release_notes (aws-crt-python)	47s
downstream (aws-crt-python)	7m 53s
aws-c-cal (musllinux-1-1-x64)	2m 53s
compilers (gcc-11)	50s
release_notes (aws-iot-device-sdk-python-v2)	4s
downstream (aws-crt-cpp)	7m 25s
downstream (aws-crt-java)	9m 37s
downstream (aws-crt-nodejs)	5m 32s
swift (swift-5-ubuntu-x64)	33s
swift (swift-5-centos-x64)	32s
swift (swift-5-al2-x64)	32s
std-compat (gcc-8, c++11)	8m 26s
std-compat (gcc-8, c++14)	8m 13s
std-compat (gcc-8, c++17)	7m 54s
std-compat (gcc-8, c++2a)	6m 46s
std-compat (clang-9, c++11)	6m 25s
std-compat (clang-9, c++14)	8m 14s
std-compat (clang-9, c++17)	6m 26s
std-compat (clang-9, c++2a)	6m 27s
All Sanity Tests passed	0s
	3h 39m 20s

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