Add alarm_table_font_size

[LordIdra]

Adds a alarm_table_font_size to settings.ini which does what you think it does:

e.g.

org.phoebus.applications.alarm/alarm_table_font_size=25

Set to 12px by default

The icon textures are only 32x32 which means they can look blurry on larger font sizes. But fixing this seems out of scope for this PR (I can just open an issue to add higher-res icons if needed)

Closes #3943

Checklist

• Testing: Tested alarm table with different font sizes, including with resetting the memento
• Documentation: Auto-generated on preference listing page

Also can someone please give me a pointer on how to do the '- [ ] Added an entry when adding a new feature' checklist item? docs/source/changelog.rst seems very outdated

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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