refactor: shared command descriptions and --cwd default

[BobbieGoede]

🔗 Linked issue

• drop legacy rootDir arg #450

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Is this a refactor and/or docs change 🤷

I found the ROOTDIR and cwd default value or fallback value a bit confusing, these changes should be functionally the same but instead handles the fallback to the shared argument configuration. Please make sure to check I'm not misunderstanding the fallback logic 😬

I'm slowly working on syncing the descriptions between the command usage -h output and those described on docs/api/commands pages, more PRs to come.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.13636% with 87 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@588a76a). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/commands/_shared.ts	4.76%	20 Missing ⚠️
src/commands/module/add.ts	0.00%	5 Missing ⚠️
src/commands/add.ts	0.00%	4 Missing ⚠️
src/commands/analyze.ts	0.00%	4 Missing ⚠️
src/commands/build-module.ts	0.00%	4 Missing ⚠️
src/commands/build.ts	0.00%	4 Missing ⚠️
src/commands/dev-child.ts	0.00%	4 Missing ⚠️
src/commands/dev.ts	0.00%	4 Missing ⚠️
src/commands/prepare.ts	0.00%	4 Missing ⚠️
src/commands/preview.ts	0.00%	4 Missing ⚠️
... and 9 more

Additional details and impacted files

@@          Coverage Diff           @@
##             main    #592   +/-   ##
======================================
  Coverage        ?   1.31%           
======================================
  Files           ?      44           
  Lines           ?    2882           
  Branches        ?      44           
======================================
  Hits            ?      38           
  Misses          ?    2803           
  Partials        ?      41           

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[BobbieGoede]

I split up sharedArgs into cwdArgs and logLevelArgs, as not all commands actually used the --log-level, this removes some noise from the docs as well in nuxt/nuxt#30199