RFR: 8340799: Add border inside instruction frame in PassFailJFrame

[Alexey Ivanov]

On Thu, 3 Oct 2024 15:05:50 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> This changeset unifies borders used inside the `PassFailJFrame` framework and adds missing borders.
> 
> I started it in ![21038](https://git.openjdk.org/jdk/pull/21038) for [JDK-8340306](https://bugs.openjdk.org/browse/JDK-8340306). That changeset handled only the instructions.
> 
> This changeset add a border around the entire contents of the instruction frame, adds a border to the log area as well as to the failure reason dialog. The result looks more pleasing and consistent.
> 
> I chose the gap of 4 because it plays nicely with fractional scales: 4 × 1.25 = 5 — no fractional pixels.

A couple of screenshots for comparison.

**Before:**  
![Screenshot of PrintLatinCJKTest where no borders are added to `PassFailJFrame` instruction UI](https://github.com/user-attachments/assets/33d309a9-5904-40f6-803c-cb1161bca1a1)

**After:**  
![Screenshot of PrintLatinCJKTest with added borders in `PassFailJFrame` instruction UI](https://github.com/user-attachments/assets/d955e717-8d48-479d-9713-f2848e56ac2c)

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PR Comment: https://git.openjdk.org/jdk/pull/21327#issuecomment-2391769964