RFR: 8340306: Add border around instructions in PassFailJFrame

[lawrence.andrews]

On Tue, 17 Sep 2024 12:52:46 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> A trivial change which adds border around instruction text. It makes the text easier to read.
>> 
>> (In some tests, people added leading spaces to each line to make the instructions easier to read; with the added border, there's no need for this trick.)
>
> **Updated look:**
> 
> ![Screenshot of PrintLatinCJKTest with border around text](https://github.com/user-attachments/assets/93311a78-6339-42f0-97e6-89661bb21743)
> 
> The text is no longer attaches to the left of the frame.
> 
> **Previous look:**
> 
> ![Screenshot of PrintLatinCJKTest without border around text](https://github.com/user-attachments/assets/516c168d-94ea-4df8-befb-5afc3559df37)

@aivanov-jdk  thanks for adding . Now the test instruction looks highlighted. 
 LGTM

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PR Comment: https://git.openjdk.org/jdk/pull/21038#issuecomment-2356361363