PERF: set text size on resize event, not on paint event, to avoid 100% cpu

[ZLLentz]

Description

Move the dynamic text resizing to resize event so it doesn't happen every frame and use the entire cpu

Motivation and Context

https://jira.slac.stanford.edu/browse/ECS-5143

How Has This Been Tested?

Interactively to observe the usage
Tests slightly adjusted so they still pass (previously was looking for the paint event)

Where Has This Been Documented?

Here and in release notes

Pre-merge checklist

• Code works interactively
• Code contains descriptive docstrings, including context and API
• New/changed functions and methods are covered in the test suite where possible
• Code has been checked for threading issues (no blocking tasks in GUI thread)
• Test suite passes locally
• Test suite passes on GitHub Actions
• Ran docs/pre-release-notes.sh and created a pre-release documentation page
• Pre-release docs include context, functional descriptions, and contributors as appropriate

[ZLLentz]

This is a draft for now
Robert and I figured this out together
deploying in dev_conda

[ZLLentz]

If the tests pass here, then something in #606 is breaking the suite. I have at least one guess already.
If the tests fail here, then there's a more fundamental issue.

[ZLLentz]

I guess I'll be taking a stab at an independent "fix atef CI tests" PR. I'll start by comparing package versions.

[tangkong]

I guess I'll be taking a stab at an independent "fix atef CI tests" PR. I'll start by comparing package versions.

Do you mean typhos here? Or did something about atef die without me knowing?

[ZLLentz]

I meant typhos

[tangkong]

LGTM.