Show validation errors for Qute project without opening a Qute template file

[angelozerr]

Once #810 will be merged, it should be nice to show validation errors for Qute project without opening a Qute template file.

To do that we need:

• on vscode-quarkus we will need to add activationEvents on "workspaceContains:**/src/main/resources/templates"to start the Qute LS.
• on Qute LS side we need to loop for workspace folders to load Qute project which will trigger validation.