Add WebGL visual regression tests for core transform functions

[aashu2006]

Topic

Description

WebGL transform functions (translate, rotate, and scale) currently do not have dedicated visual regression coverage in the dev-2.0 branch.

While these transforms are used throughout existing tests, there are no focused visual tests whose primary purpose is to validate their behavior in WebGL mode.

Proposal

Add a small, low-risk set of visual regression tests that verify basic transform behavior in WebGL:

• translate() moves shapes correctly along the x and y axes
• rotate() applies z-axis rotation correctly
• scale() uniformly scales geometry

Scope

• Visual tests only
• No rendering, engine, or API changes
• No refactoring of existing tests

Goal

Provide baseline visual regression protection for fundamental WebGL transform operations and reduce the risk of future regressions during p5.js 2.0 development.

Initial Tests Planned

• translate() moves shapes in x and y axes
• rotate() rotates shapes around z-axis
• scale() uniformly scales shapes

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[aashu2006]

I have opened a PR adding the proposed WebGL transform visual regression tests here:
#8465

The PR adds three low-risk visual tests for translate(), rotate(), and scale() in WebGL mode, scoped to tests only.