Rename remoteDevelopmentClusterAgents type internally to workspacesClusterAgents and corresponding GraphQL queries

MRs:

Query Organization cluster agents when attempti... (!194493 - merged)

Cleanup cluster-agent and workspaces-config Gra... (!196703 - merged)

Description

namespace.remoteDevelopmentClusterAgents has been deprecated, but unfortunately, we cannot yank it out yet in 18.0 due to new breaking change guidelines.

We should, however, update our frontend client code and specs to reference the preferred workspacesClusterAgents type.

Also needed and relevant to this epic is that the front-end GraphQL queries and coupled code are renamed to take into account that there are namespace cluster agents and organization cluster agents.

Acceptance criteria

• namespace.remoteDevelopmentClusterAgents renamed to use namespace.workspacesClusterAgents
• queries and code in client code are renamed to take context into account (org agent query vs namespace agent query)
• backend and frontend specs are updated to match name changes

Implementation plan