fix: watchOptions.ignored use array glob instead of regexp

[2heal1]

Summary

Both Webpack and Rspack have the watchOptions.ignore type as Regexp | string | string[] , if the internal configuration is Regexp , it's difficult for users to expand this config, so recommend to use array instead.

before

const rsbuildConfig = watchOptions.ignored;
watchOptions.ignored = [ transform(rsbuildConfig), userConfig ]

after

const rsbuildConfig = watchOptions.ignored;
watchOptions.ignored = [ ...rsbuildConfig, userConfig ]

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[chenjiahan]

I actually used RegExp instead of array intentionally for several reasons:

1. I prefer to allow users to "override" the default value rather than "merge with" the default value. Since some users may want to watch node_modules, it should be easy for them to override the default behavior.
2. RegExp has better performance. When using glob patterns, Rspack will use glob-to-regexp to generate a complex RegExp, which may slow down the build.

[2heal1]

gotcha , in fact i just need to modify webpack config , and i find the issue seems to be solved . Okay i will close this pr