fix: default sideEffect option is delivered to rollup

[XiSenao]

Description

fix: #15660

Additional context

I think the priority of sideEffect in package.json is higher than the moduleSideEffects configuration in rollup, and the configuration takes precedence over the default value true. When the sideEffect option is not specified in package.json, pass null value to rollup. rollup will determine the value of moduleSideEffects based on the treeshake.moduleSideEffects configuration item or a fallback default value of true.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[bluwy]

Makes sense to me. It seems to be what @rollup/plugin-node-resolve does too: https://github.com/rollup/plugins/blob/2a19079892f0bef53b557da965339cdef0a13a93/packages/node-resolve/src/util.js#L100