[js/web] update default export to include webgpu

[fs-eire]

Description

This PR changes the following exports:

• onnxruntime-web now is same to onnxruntime-web/webgpu.
• onnxruntime-web/webgpu is deprecating.

Migration instructions:

• use onnxruntime-web instead of onnxruntime-web/webgpu.
• use onnxruntime-web/wasm if want to use onnxruntime-web without webgpu/webnn.

Export table

file name	export entry	includes WASM	includes JSEP (WebGPU & WebNN)	includes WebGL
ort.all.min.js ort.all.js ort.all.min.mjs ort.all.mjs	onnxruntime-web/all	✔️	✔️	✔️
ort.min.js ort.js ort.min.mjs ort.mjs	onnxruntime-web	✔️	❌ --> ✔️	✔️ -->❌
ort.webgpu.min.js ort.webgpu.js ort.webgpu.min.mjs ort.webgpu.mjs	onnxruntime-web/webgpu	✔️	✔️	❌
ort.wasm.min.js ort.wasm.js ort.wasm.min.mjs ort.wasm.mjs	onnxruntime-web/wasm	✔️	❌	❌

[gyagp]

Per my understanding, onnxruntime-web is more like the default one, while onnxruntime-web/* are for specific usages. Can we leave onnxruntime-web/webgpu as is (for symmetry), and have onnxruntime-web (without /) map to the files for onnxruntime-web/webgpu (ort.webgpu.)?
Furthermore, can we rename onnxruntime-web to onnxruntime, as we already know it will be used on the web. This could be another breaking change.

[fs-eire]

Per my understanding, onnxruntime-web is more like the default one, while onnxruntime-web/* are for specific usages. Can we leave onnxruntime-web/webgpu as is (for symmetry), and have onnxruntime-web (without /) map to the files for onnxruntime-web/webgpu (ort.webgpu.)? Furthermore, can we rename onnxruntime-web to onnxruntime, as we already know it will be used on the web. This could be another breaking change.

One reason that I want to deprecate ort.webgpu.min.js is because it is actually JSEP, not webgpu. JSEP build contains webgpu and webnn and is based on wasm. "onnxruntime-web/webgpu" will be kept in a few version anyway so we can decide whether to remove it or not then

[fs-eire]

E2E test fixed.