fix(emotion): should use source code for computing hash

[hyf0]

Related issue (if exists)

Fixes #2922

Summary

The PR fixes the hash collision problem of emotion. The build_info.hash Rspack give to emotion plugin is empty for every module, so it's easily generate the same hash value for different modules.

This PR fixes the problem by passing the hash value computed by the source code of each module to emotion plugin.

🤖 Generated by Copilot at ae439ab

This pull request improves the emotion style generation for JavaScript files by using the source code as the basis for class names. It modifies the parse_and_generate function and the emotion visitor in visitors/mod.rs, and passes the source code as an argument in parser_and_generator/mod.rs.

Walkthrough

🤖 Generated by Copilot at ae439ab

• Pass source code as a string to parse_and_generate function to generate unique class names for emotion styles (link, link, link)
• Remove unused hash variable and argument from parse_and_generate function and emotion visitor (link, link)
• Update emotion visitor in crates/rspack_plugin_javascript/src/visitors/mod.rs to use source code hash instead of build info hash for class names (link)