Run tests for new/experimental features if ANY part of the feature is available

[kainino0x]

As described here:

• Detection of non optional new features gpuweb#5481 (comment)
• CTS tests for proposed but not approved items gpuweb#5480 (comment)

We don't control how websites do their feature detection, so if ANY part of the feature is visible, we need to test that ALL parts of the feature work correctly.

For example for Immediates:

navigator.gpu.wgslLanguageFeatures.has('immediate_address_space') || 'maxImmediateSize' in GPUSupportedLimits.prototype || 'setImmediate' in GPUComputePassEncoder.prototype || 'setImmediate' in GPURenderPassEncoder.prototype || 'setImmediate' in GPURenderBundleEncoder.prototype

Affects at least:

• Immediates (cc @shaoboyan091)
• Transient attachments (cc @beaufortfrancois) Never mind, I was wrong about this, transient attachments only add one feature-detectable thing so it's already correct.

but there should be several others.

[kainino0x]

cc also @shaoboyan091

[kainino0x]

Oops I mixed up immediates and transient attachments in my original comment. Fixed.