[BaseProgressIndicator] Gets invisible on sharedElementReturnTransition

@hunterstich is already working on this.

Since Nov 2, 2021.

**Description:** Because of some of the internal `BaseProgressIndicator` `onWindowVisibilityChanged`/`onDetachedFromWindow` operations, the progress bar gets hidden before it's rendered to transition like `sharedElementReturnTransition`. That results in a bad visual experience, as shown in the attached video.

**Expected behavior:** `BaseProgressIndicator` (`LinearProgressIndicator`...) is properly rendered into a transition scene.

**Source code:**

```
sharedElementReturnTransition = MaterialContainerTransform().also {
it.drawingViewId = R.id.mainFragmentContainerView
it.duration = 2000
it.startShapeAppearanceModel = ShapeAppearanceModel().withCornerSize(
resources
.getDimensionPixelOffset(R.dimen.default_card_corner_radius)
.toFloat()
)
it.endShapeAppearanceModel = ShapeAppearanceModel().withCornerSize(
resources
.getDimensionPixelOffset(R.dimen.default_card_corner_radius)
.toFloat()
)
it.startContainerColor = requireContext().themeColor(android.R.attr.colorBackground)
it.endContainerColor = requireContext().themeColor(R.attr.colorSurface)
it.setPathMotion(MaterialArcMotion())
}
```

**Android API version:** 30

**Material Library version:** 1.5.0-alpha05

**Device:** Samsung Galaxy S20 Ultra, Pixel 4 API 30 emulator

**Video:**

https://user-images.githubusercontent.com/3989453/139028873-fc8a33f9-2005-4a7d-9c95-77fcb31b2db4.mp4