Mesh::merge to return a Result #56525

Job	Run time
build (windows-latest)	10m 53s
check-bevy-internal-imports	4s
build (ubuntu-latest)	5m 53s
check-doc	9m 57s
check-missing-examples-in-docs	33s
build (macos-latest)	4m 33s
ci	2m 38s
miri	13m 36s
run-examples-macos-metal	4m 35s
toml	1m 58s
typos	5s
check-missing-features-in-docs	41s
markdownlint	1m 4s
check-compiles-no-std	1m 39s
check-compiles	4m 57s
msrv	57s
build-wasm-atomics	1m 26s
build-wasm	56s
	1h 6m 25s

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