Remove TreeViewSpinner with QtSvg dependency

- The `TreeViewSpinner` widget was not used anywhere
- The `QtSvg` dependency does not exist in BorisFX Silhouette so removing it was easiest to make Silhouette not error on this import

client/ayon_core/tools/utils/views.py

@@ -1,7 +1,6 @@
-from ayon_core.resources import get_image_path
 from ayon_core.tools.flickcharm import FlickCharm
 
-from qtpy import QtWidgets, QtCore, QtGui, QtSvg
+from qtpy import QtWidgets, QtCore, QtGui
 
 
 class DeselectableTreeView(QtWidgets.QTreeView):
@@ -19,48 +18,6 @@ class DeselectableTreeView(QtWidgets.QTreeView):
         QtWidgets.QTreeView.mousePressEvent(self, event)
 
 
-class TreeViewSpinner(QtWidgets.QTreeView):
-    size = 160
-
-    def __init__(self, parent=None):
-        super(TreeViewSpinner, self).__init__(parent=parent)
-
-        loading_image_path = get_image_path("spinner-200.svg")
-
-        self.spinner = QtSvg.QSvgRenderer(loading_image_path)
-
-        self.is_loading = False
-        self.is_empty = True
-
-    def paint_loading(self, event):
-        rect = event.rect()
-        rect = QtCore.QRectF(rect.topLeft(), rect.bottomRight())
-        rect.moveTo(
-            rect.x() + rect.width() / 2 - self.size / 2,
-            rect.y() + rect.height() / 2 - self.size / 2
-        )
-        rect.setSize(QtCore.QSizeF(self.size, self.size))
-        painter = QtGui.QPainter(self.viewport())
-        self.spinner.render(painter, rect)
-
-    def paint_empty(self, event):
-        painter = QtGui.QPainter(self.viewport())
-        rect = event.rect()
-        rect = QtCore.QRectF(rect.topLeft(), rect.bottomRight())
-        qtext_opt = QtGui.QTextOption(
-            QtCore.Qt.AlignHCenter | QtCore.Qt.AlignVCenter
-        )
-        painter.drawText(rect, "No Data", qtext_opt)
-
-    def paintEvent(self, event):
-        if self.is_loading:
-            self.paint_loading(event)
-        elif self.is_empty:
-            self.paint_empty(event)
-        else:
-            super(TreeViewSpinner, self).paintEvent(event)
-
-
 class TreeView(QtWidgets.QTreeView):
     """Ultimate TreeView with flick charm and double click signals.