Proposal: Better error message when "holding it wrong" for mapping up actions

[olivermt]

If you accidentally do create :foo, :some_generic_action in the graphql block, you get this rather cryptic error:

== Compilation error in file lib/safari_web/graphql_schema.ex ==
** (KeyError) key :error_location not found in: %AshGraphql.Resource.Mutation{
  name: :supplemental_document_create,
  action: %Ash.Resource.Actions.Action{
    name: :create_graphql,
    description: nil,
    returns: Safari.Types.SafariFileUploadInfo,
    run: {Ash.Resource.Action.ImplementationFunction,
     [
       fun: &Safari.Outcrop.SupplementalDocument.run_0_generated_174EE05532EAC7ACD9CA74CC91968491/2
     ]},
    constraints: [
      fields: [
        token: [allow_nil?: false, constraints: [], type: Ash.Type.String],
        path: [allow_nil?: false, constraints: [], type: Ash.Type.String]
      ]
    ],
    touches_resources: [],
    skip_unknown_inputs: [],
    arguments: [
      %Ash.Resource.Actions.Argument{
        allow_nil?: false,
        type: Safari.Types.SupplementalDocumentnitialInput,
        name: :note,
        default: nil,
        sensitive?: false,
        description: nil,
        public?: true,
        constraints: [
          fields: [
            note: [allow_nil?: true, constraints: [], type: Ash.Type.String],
            outcrop_id: [
              allow_nil?: true,
              constraints: [],
              type: Ash.Type.Integer
            ],
            study_id: [
              allow_nil?: true,
              constraints: [],
              type: Ash.Type.Integer
            ]
          ]
        ]
      }
    ],
    allow_nil?: false,
    transaction?: false,
    primary?: false,
    type: :action
  },
  type: :create,
  identity: nil,
  read_action: nil,
  resource: nil,
  upsert?: false,
  upsert_identity: false,
  modify_resolution: nil,
  relay_id_translations: [],
  description: nil,
  hide_inputs: []
}
    (ash_graphql 1.7.6) lib/resource/resource.ex:1123: anonymous fn/5 in AshGraphql.Resource.mutation_types/4
    (elixir 1.17.2) lib/enum.ex:4353: Enum.flat_map_list/2
    (ash_graphql 1.7.6) lib/domain/domain.ex:293: anonymous fn/5 in AshGraphql.Domain.type_definitions/8
    (elixir 1.17.2) lib/enum.ex:4353: Enum.flat_map_list/2
    (elixir 1.17.2) lib/enum.ex:4354: Enum.flat_map_list/2
    (ash_graphql 1.7.6) lib/domain/domain.ex:284: AshGraphql.Domain.type_definitions/8
    deps/ash_graphql/lib/ash_graphql.ex:334: Safari.Outcrop.AshTypes.run/2
    (absinthe 1.7.9) lib/absinthe/pipeline.ex:408: Absinthe.Pipeline.run_phase/3

I do think there is more than enough introspection available to make this error message better in this error path.