Adding taptree_of_horror example. #2083

Job	Run time
Docs - stable toolchain (recent)	35s
Bench - nightly toolchain (recent)	59s
Docs - nightly toolchain (recent)	37s
Embedded	1m 15s
Format - nightly toolchain	14s
Integration tests - stable toolchain (26_0)	48s
Test - 1.63.0 toolchain (minimal)	4m 32s
Integration tests - stable toolchain (25_2)	49s
Lint - nightly toolchain (recent)	41s
Test - 1.63.0 toolchain (recent)	4m 17s
Test - nightly toolchain (minimal)	14m 36s
Integration tests - stable toolchain (25_1)	56s
Test - nightly toolchain (recent)	14m 39s
Integration tests - stable toolchain (25_0)	52s
Test - stable toolchain (minimal)	16m 3s
Integration tests - stable toolchain (24_2)	53s
Test - stable toolchain (recent)	16m 42s
Integration tests - stable toolchain (24_1)	50s
Integration tests - stable toolchain (24_0_1)	1m 4s
Integration tests - stable toolchain (23_2)	1m 7s
Integration tests - stable toolchain (23_1)	50s
Integration tests - stable toolchain (23_0)	46s
Integration tests - stable toolchain (22_1)	47s
Integration tests - stable toolchain (22_0)	52s
Integration tests - stable toolchain (0_21_2)	1m 0s
Integration tests - stable toolchain (0_20_2)	1m 1s
Integration tests - stable toolchain (0_19_1)	48s
Integration tests - stable toolchain (0_18_1)	46s
Integration tests - stable toolchain (0_17_1)	59s
	1h 30m 18s

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