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. <!-- DO NOT TOUCH BELOW -->
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