RFR: 8285360: [TestBug] Cleanup a few ignored javafx.controls unit tests [v2]

[Ajit Ghaisas]

> This PR is to cleanup a few `javafx.controls` unit tests that were ignored. 
> 
> Here is the list of targeted unit test classes- 
> - Ignored tests re-enabled and fixed - `DateCellTest`, `CellTest`, `PaginationTest`
> - Ignored tests removed -  `RadioMenuItemTest`, `PopupControlTest`
> 
> Results of `javafx.controls` unit tests-
> **Before this PR :** 
> Total tests - 8610
> Failures - 0
> Ignored - 246
> 
> **After this PR :** 
> Total tests - 8608
> Failures - 0
> Ignored - 235

Ajit Ghaisas has updated the pull request incrementally with one additional commit since the last revision:

  address review comments

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/780/files
  - new: https://git.openjdk.java.net/jfx/pull/780/files/679c54e2..2d8366fc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=780&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=780&range=00-01

  Stats: 9 lines in 3 files changed: 9 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/780.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/780/head:pull/780

PR: https://git.openjdk.java.net/jfx/pull/780