Use cached icons in Component Browser

[farmaazon]

Pull Request Description

Closes #5189

The component browser uses cached icons, both on the cached list and the navigator panel. It reduced the number of draw calls by 18.

Important Notes

Checklist

Please include the following checklist in your PR:

• The documentation has been updated if necessary.
• All code conforms to the
  Scala,
  Java,
  and
  Rust
  style guides.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed: Enso GUI was tested when built using BOTH
    ./run ide build and ./run ide watch.

[vitvakatu]

QA report

Issues

The icons of the component browser look visibly worse than before.

Before: (current develop)

After:

Note the blurred "A" and "5" in text input/number input icons, and also a thinner circle in local scope icon.

Icons demo scene:

Before:

After:

Note the two icons on the right and how the plus shape in the center looks different even when the dimensions are the same. These icons are not pixel-aligned, though.

Other issues

Reported #5786, this is probably not caused by this PR.

[farmaazon]

@vitvakatu Fixes apply, please check them out.

[vitvakatu]

Looks much better, though I still see a subtle difference
Develop:

Latest commit:

(I judge by the letter "A" in the text input icon.

Though the difference is relatively minimal, we can accept it.