avm1: Remove all uses of static strings in tests code #27654

Job	Run time
Paths filter	8s
Check dependencies	1m 35s
Test Rust stable / ubuntu-24.04	5m 43s
Lints with Rust stable	4m 26s
Test Rust stable / windows-latest	11m 21s
Lints with Rust beta	4m 6s
Test Rust stable / macos-14	3m 51s
Lints with Rust nightly	4m 0s
Test Rust nightly / ubuntu-24.04	4m 27s
Test Rust beta / ubuntu-24.04	5m 39s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
	45m 16s

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