RFR: JDK-8294680: Refactor scaled border rendering

[Harshitha Onkar]

In this fix, the common code required for scaled border rendering is unified and added to SwingUtilities3. This is achieved by adding a functional interface to SwingUtilities3 and calling the the respective paintBorder function passed as parameter to method.  

The following steps are common for any border scaling -

- Resetting transform.
- Calculating new width, height, x & y-translations.
- Perform the required border rendering. 
- And at the end restore the previous transform.

To test the refactored code, 3 separate border scaling instances were taken (details below) and the SwingUtilities3.paintBorder, (containing the common functionality) was applied. All the tests associated with the respective border changes pass.

1. EtchedBorder - [PR#7449](https://github.com/openjdk/jdk/pull/7449) - Test: ScaledEtchedBorderTest.java
2. LineBorder - [PR#10681](https://github.com/openjdk/jdk/pull/10681) - Test: ScaledLineBorderTest & ScaledTextFieldBorderTest.java
3. JInternalFrame Border - [PR#10274](https://github.com/openjdk/jdk/pull/10274) - Test: InternalFrameBorderTest.java

The advantage of this solution is - it avoids code repetition and can be reused across all the border classes requiring border scaling fix.

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Commit messages:
 - Refactoring changes
 - Merge branch 'master' into RefactorBorder_8294484
 - revert MetalBorder changes
 - merge master
 - refactoring changes - initial commit

Changes: https://git.openjdk.org/jdk/pull/11571/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11571&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294680
  Stats: 272 lines in 4 files changed: 94 ins; 146 del; 32 mod
  Patch: https://git.openjdk.org/jdk/pull/11571.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11571/head:pull/11571

PR: https://git.openjdk.org/jdk/pull/11571