Code view likely references old script objects after hot reload

If a script is changed as the result of a hot reload, the `Script` object needs to be re-retrieved to get its updated VM service object ID as the internal `Script` object has been replaced by the VM.

Some issues that are likely related to this are:
- Code coverage and profiler hits disappear after a hot reload
- Rendered sources are out of date after a hot reload
- Breakpoint state isn't cleared in scripts that were hot reloaded (e.g., breakpoints are displayed even though they aren't automatically reset for the new script)