RFR: 8328667: [Testbug] Enable ignored Spinner unit tests [v2]

[Karthik P K]

> Enabled a test in `SpinnerTest` class.
> Added comment to the editing test, why it can not be enabled. When Spinner value is set using `getEditor` `setText` method, the listener added to the spinner is not invoked. There is no bug for this issue. I'm not sure about the expectation in this case.
> Other set of tests which are ignored are `LocalTimeSpinnerValueFactory` tests. Since these tests are unstable and fail only at certain time of the day, not enabling this test as well.

Karthik P K has updated the pull request incrementally with one additional commit since the last revision:

  Add bug id to ignore comment

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1414/files
  - new: https://git.openjdk.org/jfx/pull/1414/files/8e7b318f..85d726a7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1414&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1414&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1414.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1414/head:pull/1414

PR: https://git.openjdk.org/jfx/pull/1414