Consolidate Workspaces feature specs

MR: Pending

Description

Consolidate ee/spec/features/remote_development/workspaces_dropdown_group_spec.rb into ee/spec/features/remote_development/workspaces_spec.rb, as part of the single workspace lifecycle shared example.

This will increase the speed of the feature specs, and reduce flakiness, which we want to do since these feature specs are near the top of the testing pyramid.

Acceptance criteria

TODO: Fill out (required)

• Only ee/spec/features/remote_development/workspaces_spec.rb should remain, with all previous tests from ee/spec/features/remote_development/workspaces_dropdown_group_spec.rb incorporated into the single workspace lifecycle shared example.
• ee/spec/features/remote_development/workspaces_dropdown_group_spec.rb is deleted.