avm2: Cover special cases in Number.toExponential #30782

Job	Run time
Paths filter	9s
Lints with Rust beta	5m 41s
Coverage Report	12m 23s
Lints with Rust nightly	6m 19s
Check dependencies	55s
Lints with Rust stable	4m 53s
Test Rust beta / ubuntu-24.04	6m 42s
Test Rust stable / ubuntu-24.04-arm	5m 20s
Test Rust stable / ubuntu-24.04	6m 39s
Test Rust stable / windows-2025	10m 58s
Test Rust nightly / ubuntu-24.04	6m 52s
Test Rust stable / macos-15	5m 24s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Lints with Rust ${{ matrix.rust_version }}	-1s
	1h 12m 14s

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