mochajs / mocha / 7279

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refactor validatePlugins to throw coded errors

- add `createInvalidPluginError` for reporters, UIs, and future plugins
- ensures the original error is output if the module exists, but it throws (see `test/node-unit/cli/fixtures/bad-module.fixture.js`)
- remove unneeded `process.cwd()` from call to `path.resolve()`

Ref: #4198

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