refactor: move resource into it's own domain

Resource domain methods are generally used idependently of an
application thus can be move it an individual domain.

domain/application/errors/errors.go

@@ -132,22 +132,6 @@ const (
 	// is found, an error is returned.
 	MultipleCharmHashes = errors.ConstError("multiple charm hashes found")
 
-	// ResourceNotFound describes an error that occurs when a resource is
-	// not found.
-	ResourceNotFound = errors.ConstError("resource not found")
-
-	// UnknownResourceType describes an error where the resource type is
-	// not oci-image or file.
-	UnknownResourceType = errors.ConstError("unknown resource type")
-
-	// UnknownRetrievedByType describes an error where the retrieved by type is
-	// neither user, unit nor application.
-	UnknownRetrievedByType = errors.ConstError("unknown retrieved by type")
-
-	// ResourceNameNotValid describes an error where the resource name is not
-	// valid, usually because it's empty.
-	ResourceNameNotValid = errors.ConstError("resource name not valid")
-
 	// AlreadyDownloadingCharm describes an error that occurs when a charm is
 	// already being downloaded.
 	AlreadyDownloadingCharm = errors.ConstError("already downloading charm")

domain/application/service/application_test.go

@@ -35,7 +35,6 @@ import (
 	storageerrors "github.com/juju/juju/domain/storage/errors"
 	domaintesting "github.com/juju/juju/domain/testing"
 	"github.com/juju/juju/internal/charm"
-	charmresource "github.com/juju/juju/internal/charm/resource"
 	"github.com/juju/juju/internal/errors"
 	loggertesting "github.com/juju/juju/internal/logger/testing"
 	"github.com/juju/juju/internal/storage"
@@ -1226,17 +1225,13 @@ func (s *applicationWatcherServiceSuite) setupMocks(c *gc.C) *gomock.Controller
 		}
 	})
 
-	resourceStoreGetter := NewMockResourceStoreGetter(ctrl)
-	resourceStoreGetter.EXPECT().AddStore(charmresource.TypeContainerImage, gomock.Any())
-
 	modelUUID := modeltesting.GenModelUUID(c)
 
 	s.clock = testclock.NewClock(time.Time{})
 	s.service = NewWatchableService(
 		s.state,
 		s.secret,
 		registry,
-		resourceStoreGetter,
 		modelUUID,
 		s.watcherFactory,
 		nil,