Enable watch mode for DTA, DPTA when editing linked monorepo dependencies.

[hl662]

Display-test-app, uses vite to build and run locally. It uses many of the workspace linked packages in itwinjs-core (core-frontend, core-bentley, etc...). Hot module reloading doesn't work out of the box with workspace linked deps. I.e, while DTA is running, editing source code in core frontend won't tell the vite server to reload and recompile DTA. Perhaps we can improve the vite configuration to watch for source code edits from our workspace linked deps, improving the developer experience.