Add MIPS32 cross compilation, refactor existing cross-compilation jobs #2476

Job	Run time
address-sanitizer	31m 2s
linux-gcc-4_4	16m 56s
thread-sanitizer	30m 32s
Mac Intel, gcc, Shared OpenSSL	28m 48s
Mac Intel, gcc, Static OpenSSL	26m 38s
undefined-behavior-sanitizer	35m 12s
mbedtls-ubuntu-clang	27m 13s
Mac Intel, gcc, Shared MbedTLS	21m 9s
Mac Intel, gcc, Static MbedTLS	24m 3s
Mac Intel, clang, Shared OpenSSL	38m 15s
mbedtls-ubuntu-gcc	26m 40s
mbedtls-ubuntu-gcc-11	28m 33s
Mac Intel, clang, Static OpenSSL	37m 59s
Mac Intel, clang, Shared MbedTLS	38m 10s
static-build-linux	19m 11s
Mac Intel, clang, Static MbedTLS	33m 41s
Mac Apple Silicon, gcc, Shared OpenSSL	23m 8s
Mac Apple Silicon, gcc, Static OpenSSL	22m 54s
Mac Apple Silicon, gcc, Shared MbedTLS	20m 44s
Mac Apple Silicon, gcc, Static MbedTLS	19m 41s
Mac Apple Silicon, clang, Shared OpenSSL	30m 0s
Mac Apple Silicon, clang, Static OpenSSL	28m 24s
Mac Apple Silicon, clang, Shared MbedTLS	28m 58s
Mac Apple Silicon, clang, Static MbedTLS	28m 58s
clang-format-check	19s
mbedtls-ubuntu-gcc-4_4-build	2m 43s
sample-check	4m 49s
sample-check-no-data-channel	4m 35s
stack-size-check	4m 14s
ubuntu-os-build	30m 0s
ubuntu-os-build-stats-calc-control	28m 25s
windows-msvc-openssl	24m 12s
valgrind-check	4m 11s
	12h 50m 17s

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