Support conversion of multi-Xprivs into multi-Xpubs #2048

Job	Run time
Bench - nightly toolchain (recent)	1m 4s
Docs - nightly toolchain (recent)	33s
Docs - stable toolchain (recent)	23s
Embedded	1m 15s
Format - nightly toolchain	14s
Integration tests - stable toolchain (26_0)	1m 2s
Lint - nightly toolchain (recent)	29s
Test - 1.63.0 toolchain (minimal)	26m 10s
Integration tests - stable toolchain (25_2)	1m 11s
Test - 1.63.0 toolchain (recent)	25m 16s
Test - nightly toolchain (minimal)	14m 22s
Integration tests - stable toolchain (25_1)	52s
Test - nightly toolchain (recent)	14m 3s
Test - stable toolchain (minimal)	17m 15s
Integration tests - stable toolchain (25_0)	48s
Test - stable toolchain (recent)	16m 56s
Integration tests - stable toolchain (24_2)	1m 53s
Integration tests - stable toolchain (24_1)	1m 49s
Integration tests - stable toolchain (24_0_1)	1m 48s
Integration tests - stable toolchain (23_2)	1m 47s
Integration tests - stable toolchain (23_1)	1m 27s
Integration tests - stable toolchain (23_0)	48s
Integration tests - stable toolchain (22_1)	1m 15s
Integration tests - stable toolchain (22_0)	55s
Integration tests - stable toolchain (0_21_2)	53s
Integration tests - stable toolchain (0_20_2)	1m 43s
Integration tests - stable toolchain (0_19_1)	1m 17s
Integration tests - stable toolchain (0_18_1)	1m 0s
Integration tests - stable toolchain (0_17_1)	1m 19s
	2h 19m 47s

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