Test: Terminal dynamic texture atlas

[Tyriar]

#50894

• macOS: @isidorn
• Linux: @aeschli
• Windows @sbatten

Complexity: 3

The terminal has a new experimental setting that will enable the dynamic texture atlas which is a more optimized way of storing terminal character glyphs. Test by running commands that generate various text foregrounds/backgrounds. The dynamic cache has several speed benefits but you should focus primarily on correctness of rendering, unless something is much slower than the default (static) strategy.

To enable add this setting and reload the window:

"terminal.integrated.experimentalTextureCachingStrategy": "dynamic"

Also make sure to remove this setting if you have it "terminal.integrated.rendererType": "dom".

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Here's the PR the feature was contributed in if you want more context: xtermjs/xterm.js#1327