tests: Add avm2/edittext_set_text_vs_html test #26890

Job	Run time
Paths filter	9s
Lints with Rust stable	4m 4s
Check dependencies	1m 30s
Lints with Rust beta	4m 8s
Lints with Rust nightly	3m 54s
Test Rust stable / ubuntu-24.04	5m 6s
Test Rust stable / windows-latest	13m 13s
Test Rust stable / macos-14	4m 26s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Test Rust nightly / ubuntu-24.04	4m 33s
Test Rust beta / ubuntu-24.04	4m 51s
	45m 54s

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