Decoder key export fixes #19385

Job	Run time
basic_clang	7m 15s
basic_gcc	7m 54s
check_docs	1m 37s
check_update	1m 58s
check-ansi	5m 40s
minimal	4m 36s
no-deprecated	7m 27s
non-caching	25m 13s
no-shared (ubuntu-latest)	6m 7s
no-shared (macos-latest)	8m 35s
address_ub_sanitizer	14m 40s
buildtest	12m 7s
enable_brotli_and_asan_ubsan	15m 21s
enable_brotli_and_zstd_dynamic	7m 27s
enable_brotli_dynamic	7m 37s
enable_non-default_options	7m 51s
enable_zstd_and_asan_ubsan	16m 4s
enable_zstd_dynamic	7m 37s
enable-tfo (ubuntu-latest)	7m 4s
enable-tfo (macos-latest)	11m 32s
external-test-pyca (1.51.0, 3.9)	10m 51s
external-tests	15m 5s
fips_and_ktls	8m 4s
legacy	6m 8s
memory_sanitizer	19m 58s
no-legacy	9m 24s
out-of-source-and-install (ubuntu-latest)	10m 6s
out-of-source-and-install (macos-latest)	14m 58s
threads_sanitizer	7m 55s
external-test-cf-quiche	8m 14s
	4h 54m 25s

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