Adds the capability to retrieve a property field by name (#30859)

* Adds the capability to retrieve a property field by name

Allows to retrieve a property field by name and groupID. As the name
is only unique within the context of a group, and we can have multiple
fields with the same name in the store, for this method the groupID is
directly included in the query instead of being an optional field.

* Adds the targetID parameter to correctly filter fields

* Ensure the method only retrieves non-deleted fields

---------

Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/storetest/mocks/PropertyFieldStore.go

@@ -120,6 +120,36 @@ func (_m *PropertyFieldStore) Get(groupID string, id string) (*model.PropertyFie
 	return r0, r1
 }
 
+// GetFieldByName provides a mock function with given fields: groupID, targetID, name
+func (_m *PropertyFieldStore) GetFieldByName(groupID string, targetID string, name string) (*model.PropertyField, error) {
+	ret := _m.Called(groupID, targetID, name)
+
+	if len(ret) == 0 {
+		panic("no return value specified for GetFieldByName")
+	}
+
+	var r0 *model.PropertyField
+	var r1 error
+	if rf, ok := ret.Get(0).(func(string, string, string) (*model.PropertyField, error)); ok {
+		return rf(groupID, targetID, name)
+	}
+	if rf, ok := ret.Get(0).(func(string, string, string) *model.PropertyField); ok {
+		r0 = rf(groupID, targetID, name)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*model.PropertyField)
+		}
+	}
+
+	if rf, ok := ret.Get(1).(func(string, string, string) error); ok {
+		r1 = rf(groupID, targetID, name)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
 // GetMany provides a mock function with given fields: groupID, ids
 func (_m *PropertyFieldStore) GetMany(groupID string, ids []string) ([]*model.PropertyField, error) {
 	ret := _m.Called(groupID, ids)