Migrate the test suite of Webpack

[hyf0]

What problem does this feature solve?

Currently, we are moving tests of Webpack single by single to test specific features. It's not ideal and the tests are mixed up.

1. easy for visualizing the compatibility.
2. fine-grained tests in years to avoid any regressions.

What does the proposed API of configuration look like?

No response

[hyf0]

Due to the good design of Webpack's test suites, in general, we should just make an alias of webpack and point to @rspack/core.