Support conversion of multi-Xprivs into multi-Xpubs #2049

Job	Run time
Docs - nightly toolchain (recent)	26s
Bench - nightly toolchain (recent)	56s
Docs - stable toolchain (recent)	19s
Embedded	2m 55s
Format - nightly toolchain	13s
Integration tests - stable toolchain (26_0)	50s
Integration tests - stable toolchain (25_2)	54s
Lint - nightly toolchain (recent)	27s
Integration tests - stable toolchain (25_1)	53s
Test - 1.63.0 toolchain (minimal)	25m 56s
Integration tests - stable toolchain (25_0)	47s
Test - nightly toolchain (minimal)	14m 27s
Test - 1.63.0 toolchain (recent)	25m 29s
Test - stable toolchain (minimal)	16m 56s
Integration tests - stable toolchain (24_2)	48s
Test - nightly toolchain (recent)	14m 10s
Test - stable toolchain (recent)	16m 36s
Integration tests - stable toolchain (24_1)	52s
Integration tests - stable toolchain (24_0_1)	58s
Integration tests - stable toolchain (23_2)	49s
Integration tests - stable toolchain (23_1)	1m 3s
Integration tests - stable toolchain (23_0)	48s
Integration tests - stable toolchain (22_1)	48s
Integration tests - stable toolchain (22_0)	49s
Integration tests - stable toolchain (0_21_2)	51s
Integration tests - stable toolchain (0_20_2)	55s
Integration tests - stable toolchain (0_19_1)	48s
Integration tests - stable toolchain (0_18_1)	1m 13s
Integration tests - stable toolchain (0_17_1)	1m 1s
	2h 13m 57s

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