Add `MAX_INSTRUCTIONS_TO_DECODE` to XCMv2 (#4978) #5

Job	Run time
check-markdown	29s
check-dependency-rules	10s
check-workspace	22s
set-image	9s
check-umbrella	2m 39s
check-rust-feature-propagation	2m 9s
check-toml-format	1m 15s
fmt	1m 23s
test-rust-features	2m 11s
	10m 47s

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