refactor 'internal tests' CI job to use github matrix #345

Job	Run time
linting	6m 5s
mavlink-dump	1m 17s
formatting	7s
internal-tests (ardupilotmega)	29s
msrv	2m 44s
internal-tests (asluav)	30s
internal-tests (autoquad)	10s
internal-tests (matrixpilot)	28s
internal-tests (minimal)	30s
internal-tests (paparazzi)	29s
internal-tests (python_array_test)	28s
internal-tests (slugs)	28s
internal-tests (standard)	28s
internal-tests (test)	27s
internal-tests (ualberta)	28s
internal-tests (uavionix)	26s
internal-tests (icarous)	27s
internal-tests (common)	30s
docs	0s
build	0s
test-embedded-size	0s
	16m 31s

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