RFR: 8320563: Remove D3D9 code paths in favor of D3D9Ex [v2]

[Lukasz Kostyra]

> JFX minimum requirements guarantee 9Ex availability, so old non-Ex paths are no longer needed.
> 
> In multiple parts (ex. Mesh, Graphics, etc.) where the Device is acquired I changed the type to explicitly use `IDirect3DDevice9Ex`. Technically it doesn't matter much (`IDirect3DDevice9Ex` inherits `IDirect3DDevice` - it was leveraged to transparently use the Ex device in the backend) but now we don't have the non-Ex device, so that keeps it a bit more consistent and clear IMO.
> 
> Verified by running tests on Windows 11, did not notice any regressions. Unfortunately I have no way to test this on older systems.

Lukasz Kostyra has updated the pull request incrementally with two additional commits since the last revision:

 - Cleanup leftover "Ex" suffixes in variable names
 - Remove leftover disableD3D9Ex Prism setting

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1445/files
  - new: https://git.openjdk.org/jfx/pull/1445/files/2dbed83d..4a9605fc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1445&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1445&range=00-01

  Stats: 7 lines in 3 files changed: 0 ins; 3 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/1445.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1445/head:pull/1445

PR: https://git.openjdk.org/jfx/pull/1445