Initial support for parallel Soroban phase XDR. #6433

Job	Run time
rust-check-git-rev-deps	16s
rust-check-git-rev-deps	16s
cargo-deny (advisories)	43s
cargo-deny (advisories)	43s
fmt	18s
fmt	18s
cargo-deny (bans licenses sources)	38s
cargo-deny (bans licenses sources)	38s
build (gcc, current)	6h 0m 15s
build (gcc, current)	1h 7m 15s
build (gcc, current, --check-test-tx-meta)	58m 17s
build (gcc, current, --check-test-tx-meta)	58m 17s
build (gcc, next)	1h 17m 57s
build (gcc, next)	1h 17m 57s
build (gcc, next, --check-test-tx-meta)	1h 1m 28s
build (gcc, next, --check-test-tx-meta)	1h 1m 28s
build (clang, current)	59m 38s
build (clang, current)	59m 38s
build (clang, current, --check-test-tx-meta)	50m 23s
build (clang, current, --check-test-tx-meta)	50m 23s
build (clang, next)	1h 2m 10s
build (clang, next)	1h 2m 10s
build (clang, next, --check-test-tx-meta)	52m 15s
build (clang, next, --check-test-tx-meta)	52m 15s
complete	1s
complete	1s
	21h 15m 38s

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