feat!: add test option to preact refresh plugin

[chenjiahan]

Summary

This PR adds a test option to @rspack/plugin-preact-refresh so loader matching can be configured separately from include, matching @rspack/plugin-react-refresh. It also aligns the defaults by moving the extension matcher to test and leaving include undefined unless explicitly configured.

Validation

• pnpm build
• pnpm lint
• pnpm test

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[Copilot]

Pull request overview

This PR adds a new test option to @rspack/plugin-preact-refresh to control loader matching independently of include, aligning behavior and defaults with @rspack/plugin-react-refresh by moving the extension-based matcher to test and leaving include unset unless configured.

Changes:

• Add test option to plugin API and use it as the Rspack rule’s test condition.
• Update defaults so test matches common JS/TS extensions (including mjs/cjs variants) while include defaults to undefined.
• Add config-case tests and update README documentation for the new option and revised include semantics.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/configCases/condition/test/rspack.config.js	Adds a config-case verifying test can target specific modules independently of include.
test/configCases/condition/test/index.js	Asserts the selected module is processed (refresh utils injected) when test matches.
test/configCases/condition/test/file.js	Imports a target module (foo) to exercise test matching.
test/configCases/condition/default-test/rspack.config.js	Adds a config-case validating default test behavior without options.
test/configCases/condition/default-test/index.js	Asserts default test processes .mjs files.
test/configCases/condition/default-test/file.mjs	Provides an .mjs module to validate default matching.
src/index.ts	Introduces test option, changes normalization/defaults, and wires test/include into the injected module rule.
README.md	Documents the new test option and updates include docs/defaults.

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