fix: support CLI rspackPath override in getRspackConfigPath

[Copilot]

cmdOptions was accepted as a parameter in getRspackConfigPath but never used, triggering @typescript-eslint/no-unused-vars warnings and leaving CLI override support unimplemented.

Changes

• get-rspack-config-path.ts: Check cmdOptions.rspackPath before falling back to the builder configuration, mirroring the pattern already used in getWebpackConfigPath
• get-rspack-config-path.spec.ts: Add test covering the CLI override precedence

// CLI rspackPath now takes precedence over nest-cli.json builder config
const rspackPath =
  getRspackConfigPath(configuration, { rspackPath: 'custom.rspack.config.ts' }, appName);
// → 'custom.rspack.config.ts'

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