Make interrupt retry delay methods Linux-only

[Copilot]

The get_interrupt_retry_delay and set_interrupt_retry_delay methods in SandboxConfiguration were available on all platforms, but the retry delay value is only used on Linux and not read or written on Windows.

Changes Made

Added #[cfg(target_os = "linux")] attributes to both methods:

• set_interrupt_retry_delay(&mut self, delay: Duration)
• get_interrupt_retry_delay(&self) -> Duration

Rationale

• Linux: Uses signal-based VCPU interruption (LinuxInterruptHandle in kvm.rs and hyperv_linux.rs) where retry delays are necessary due to timing windows when signals may not immediately interrupt the VCPU thread
• Windows: Uses WHvCancelRunVirtualProcessor (WindowsInterruptHandle in hyperv_windows.rs) which doesn't require retry delays

The struct field interrupt_retry_delay remains present on all platforms to maintain ABI compatibility, but the accessor methods are now properly scoped to Linux only.

Testing

• All existing tests pass including configuration unit tests
• The existing Linux-only integration test interrupt_custom_signal_no_and_retry_delay continues to work correctly
• Code builds successfully and passes all linting checks

Fixes #592.

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