Allow to tolerate absence of import files referenced in projectview

[dkashyn-sfdc]

Description of the feature request:

In some cases, when we are using templates, we'd like to have options to have user-specific customizations.
IJWB supposed to tolerate files absence in such cases.

It is ok to render a warning if the file is not there yet Bazel flows supposed to ignore this fact otherwise.

There should be a registry key to activate this mode and by default imports are not optional.

What underlying problem are you trying to solve with this feature?

Customization of templates.

What operating system, Intellij IDE and programming languages are you using? Please provide specific versions.

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

[dkashyn-sfdc]

Proposed PR is here #5689

[ujohnny]

@dkashyn-sfdc could you please elaborate what is the template in your context and share some more details on the usecase?

[dkashyn-sfdc]

When you import the project you can use .projectview template. We have such submitted to our VCS https://github.com/bazelbuild/intellij/pull/5227/files