Logger: Honor --loglevel for npmlog output

[LouisLau-art]

Fixes #22061.

• Ensure logger.setLogLevel updates both the new logger and the legacy npmlog instance (with sensible level mapping: trace->silly, debug->verbose).
• Make --debug actually take effect (forces loglevel=debug).
• Validate --loglevel values via commander choices.

Tests:

• yarn --cwd code vitest run --config core/vitest.config.ts core/src/node-logger/index.test.ts

Summary by CodeRabbit

• Bug Fixes

  • Improved log level option handling for more reliable CLI configuration.
  • Enhanced consistency in log level synchronization across logging systems.

• Tests

  • Added test coverage for log level synchronization and configuration consistency.

[coderabbitai]

📝 Walkthrough

Walkthrough

Refactored CLI log level option using Commander's Option API with explicit choices and default values. Introduced log level translation mapping between internal log levels and npm-log equivalents, centralized level management logic, and added synchronization tests.

Changes

Cohort / File(s)	Summary
CLI Option Refactoring code/core/src/bin/core.ts	Migrated from .option() to .addOption(new Option()) API for log level configuration; imported Option from commander; updated preAction logic to compute log level with debug flag override.
Logger Level Management code/core/src/node-logger/index.ts	Introduced toNpmLogLevel mapping function to translate internal log levels (trace→silly, debug→verbose); added setLoggerLevel helper to centralize npmLog and logger level synchronization; updated setLevel and setLogLevel methods to use the helper.
Logger Tests code/core/src/node-logger/index.test.ts	Added two new tests verifying log level synchronization with npmlog and consistency between setLevel and setLogLevel methods.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Angular: fix --loglevel options in docs and descriptions #33726: Updates allowed --loglevel values with trace/debug mapping, directly related to this PR's log level translation changes.
• Angular: Honor --loglevel and --logfile in dev/build #33212: Modifies node-logger and CLI loglevel handling, shares overlapping scope with this refactoring.

✨ Finishing touches

• 📝 Generate docstrings

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[LouisLau-art]

Friendly ping for review when you have time — this aligns --loglevel with npmlog output so the CLI flag consistently controls logging verbosity.