Project view is broken if Theia is used as IDE in a workspace

[garagatyi]

Description

Project view in a running workspace depends on Ws-agent APIs and opening it when Theia (or no IDE at all) is used shows a black screen.
We can remove this view completely or use just workspace config. We can also provide an error message when a workspace doesn't contain ws-agent.

Reproduction Steps

1. Create a workspace with Theia and add a project to it
2. Go to UD view of the project

Expected:
An error about this feature not available for a workspace (we would have the same if no IDE is present in a workspace).
Actual:
Black screen:

How it looks on a workspace with the ws-agent:

OS and version:

Diagnostics:

[garagatyi]

@ashumilova

[ashumilova]

@slemeur maybe we could remove the project details view?
Here is the information that it contains now:

It allows only to edit the description and delete the project and those actions depend on wsagent API.
When agent is not running we have following page:

No agent (in case of Theia IDE or any another except GWT one) - causes the bug described in the following issue. So to fix that we could:
option 1: Remove project details and keep only projects list with nearly the same data
option 2: Show message - there is no ws agent similar to "This project's workspace is not currently running.", but I think - wsagent is more internal stuff, which user may not be aware what that means.

I am +1 for option 1.

[AndrienkoAleksandr]

+1 For first option

[slemeur]

+1 for option1