Allow to pass --update to vitest

### Command

test

### Description

Vitest has an update command, that updates the visual regression screenshots and the snapshots. However, it is currently impossible to invoke this command, because the Angular CLI does not seem to pass it on to vitest. Just running `vitest --update` fails as well, because it is missing the vitest.config that Angular CLI seems to create in memory.

### Describe the solution you'd like

Pass the `--update` flag vitest execution.

### Describe alternatives you've considered

Maybe all arguments preceded by `--` could be automatically passed on?

Start at the Angular CLI `test` command's argument handling and reproduce the issue with Vitest's `--update` flag. Trace how the in-memory Vitest configuration is provided, then verify that the flag reaches Vitest without requiring a separate configuration file; done means visual regression screenshots and snapshots can be updated through the CLI.

Written by the indexing model from the issue text.