TSL: Fix equal() inconsistent

[sunag]

Fixes #30755

Description

Fix equality operator consistency since in WGSL it returns a vector and in GLSL a boolean thus deprecating equals() making it simpler and similar to GLSL.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.08 78.29	336.08 78.29	+0 B +0 B
WebGPU	526.03 146.59	526.26 146.63	+231 B +38 B
WebGPU Nodes	525.5 146.49	525.73 146.52	+231 B +38 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	465.15 112.18	465.15 112.18	+0 B +0 B
WebGPU	598.23 162.62	598.46 162.66	+228 B +42 B
WebGPU Nodes	553.32 152.09	553.54 152.12	+228 B +25 B