Include DevWorkspace Milestone 3 in CRW

Depends on upsteam epic https://github.com/eclipse/che/milestone/140

Some carryover items from CRW-1726:

• DONE https://github.com/eclipse/che/issues/20383 - Verify if downloading a vsix from a devfile registry with untrusted TLS cert work when DevWorkspace is enabled #20383
• DONE https://github.com/eclipse/che/issues/19182 - Simplify authentication and authorization with a more flexible and lightweight approach #19182
• DONE https://github.com/eclipse/che/issues/17898 - [devworkspace] add an ability to configure trust store e.g. for plugin registry with self-signed certs #17898
• DONE https://github.com/eclipse/che/issues/19326 - [devworkspace] How to handle configuration spread across DWO, WTO and DWCO #19326
• DONE https://github.com/eclipse/che/issues/20386 - Support OpenShift global proxy configuration and trusted certificate bundle when DevWorkspace is enabled #20386
• DONE https://github.com/eclipse/che/issues/20387 - An admin should be able to specify CA certificates that need to be trusted on devfile v2 based workspaces #20387
• DONE https://github.com/eclipse/che/issues/20385 - Adapt devfile v2 happy-path tests to verify editors and extensions functionalities #20385
• DONE https://github.com/eclipse/che/issues/18887 - Documentation updates to support DevWorkspace engine #18887