[MAC] AWT Freeze with multiple SWT_AWT bridges in one SWT app

[DenisUngemach]

Describe the bug
On Mac 26.1
In the following snippet, one of the two AWT embeddings freezes and can't be used.
This happens only sometimes, fast focus changes can cause this problem.

To Reproduce
Execute the snippet, then click on the AWT embeddings, for one the focus does not change and the AWT embedding can't be used.
Sometimes multiple tries are necessary to reproduce.

SnippetAwtFocusBug.java

Expected behavior
I expect that the AWT embeddings work.

Environment:

1. Select the platform(s) on which the behavior is seen:

• • [] All OS
• • Windows
• • Linux
• • [ X ] macOS

2. Additional OS info (e.g. OS version, Linux Desktop, etc)
   macOS Tahoe 26.1

3. JRE/JDK version
   OpenJDK Runtime Environment (build 21.0.6+7-LTS)

Version since
Standard Widget Toolkit 3.132.0.v20251002-1704 org.eclipse.swt
Also on the swt master branch.

[DenisUngemach]

With this PR this can be solved: #2901

I try to prevent unnecessary focus changes and synchronize the focus behavior of AWT with SWT.