Projectview parsing should be more resilient

### Description of the bug:

Currently it's not possible to share .projectviews between this plugin and Hirschgarten, because Hirschgarten supports more projectview attributes. This plugin refuses to use projectviews with unsupported attributes.

### Which category does this issue belong to?

_No response_

### What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.


### Which Intellij IDE are you using? Please provide the specific version.

_No response_

### What programming languages and tools are you using? Please provide specific versions.

_No response_

### What Bazel plugin version are you using?

_No response_

### Have you found anything relevant by searching the web?

_No response_

### Any other information, logs, or outputs that you want to share?

_No response_

The issue identifies projectview parsing in the Bazel IntelliJ plugin as the entry point, but names no file or test. Begin by locating that parser and reproducing the incompatibility with a projectview containing Hirschgarten-only attributes; done means those attributes no longer prevent the projectview from being used.

Written by the indexing model from the issue text.