avm2: Implement XML.removeNamespace #25048

Job	Run time
Paths filter	6s
Check dependencies	1m 32s
Test Rust stable / ubuntu-24.04	4m 38s
Test Rust stable / windows-latest	10m 57s
Lints with Rust stable	5m 5s
Test Rust stable / macos-14	3m 59s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Lints with Rust beta	4m 32s
Test Rust nightly / ubuntu-24.04	4m 35s
Lints with Rust nightly	4m 28s
Test Rust beta / ubuntu-24.04	4m 36s
	44m 28s

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