IWYU: Convert FAPI tests #123

Job	Run time
scanbuild	4m 56s
coverity-test	0s
build-test (ubuntu-20.04, gcc)	1m 10s
test-coverage	2m 0s
build-test (ubuntu-20.04, clang)	1m 9s
test-fuzz	2m 36s
build-test (fedora-32, gcc)	1m 11s
test-mbedtls (ubuntu-20.04)	1m 28s
build-test (fedora-32, clang)	1m 12s
test-no-crypto-build	1m 28s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	1m 29s
build-test (opensuse-leap, gcc)	1m 10s
test-tcti-config	1m 16s
build-test (opensuse-leap, clang)	1m 9s
build-test (ubuntu-22.04, gcc)	1m 9s
build-test (ubuntu-22.04, clang)	1m 10s
build-test (alpine-3.15, gcc)	55s
build-test (alpine-3.15, clang)	56s
	26m 24s

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