Support conversion of multi-Xprivs into multi-Xpubs #2053

Job	Run time
Docs - nightly toolchain (recent)	29s
Bench - nightly toolchain (recent)	1m 1s
Docs - stable toolchain (recent)	28s
Embedded	1m 17s
Format - nightly toolchain	14s
Integration tests - stable toolchain (26_0)	1m 3s
Lint - nightly toolchain (recent)	28s
Integration tests - stable toolchain (25_2)	56s
Test - 1.63.0 toolchain (minimal)	25m 53s
Integration tests - stable toolchain (25_1)	1m 10s
Test - 1.63.0 toolchain (recent)	25m 25s
Integration tests - stable toolchain (25_0)	1m 20s
Test - stable toolchain (minimal)	16m 17s
Test - nightly toolchain (minimal)	14m 13s
Integration tests - stable toolchain (24_2)	1m 3s
Test - stable toolchain (recent)	16m 5s
Test - nightly toolchain (recent)	14m 11s
Integration tests - stable toolchain (24_1)	57s
Integration tests - stable toolchain (24_0_1)	58s
Integration tests - stable toolchain (23_2)	1m 11s
Integration tests - stable toolchain (23_1)	1m 2s
Integration tests - stable toolchain (23_0)	1m 8s
Integration tests - stable toolchain (22_1)	59s
Integration tests - stable toolchain (22_0)	1m 11s
Integration tests - stable toolchain (0_21_2)	1m 18s
Integration tests - stable toolchain (0_20_2)	1m 7s
Integration tests - stable toolchain (0_19_1)	58s
Integration tests - stable toolchain (0_18_1)	1m 16s
Integration tests - stable toolchain (0_17_1)	1m 2s
	2h 14m 40s

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