gencomponentdocs support module all to generate all karmada components docs

[zhzhuang-zju]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
When releasing documents, it is necessary to generate reference documents for different components through gencomponentdocs. Currently, only the generation of individual components one by one is supported, which is inefficient and prone to omissions. In actual usage scenarios, a more common situation is to generate reference documents for all components at once. Therefore, I hope to introduce the "module all" to support the full-scale generation of component reference documents.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
Before:

./gencomponentdocs ../website/docs/reference/components/ karmada-webhook
./gencomponentdocs ../website/i18n/zh/docusaurus-plugin-content-docs/current/reference/components/ karmada-webhook
./gencomponentdocs ../website/docs/reference/components/ karmada-controller-manager
./gencomponentdocs ../website/i18n/zh/docusaurus-plugin-content-docs/current/reference/components/karmada-controller-manager
./gencomponentdocs ../website/docs/reference/components/ karmada-scheduler
./gencomponentdocs ../website/i18n/zh/docusaurus-plugin-content-docs/current/reference/components/ karmada-scheduler
...
./gencomponentdocs ../website/docs/reference/components/ karmada-agent
./gencomponentdocs ../website/i18n/zh/docusaurus-plugin-content-docs/current/reference/components/ karmada-agent

After:

./gencomponentdocs ../website/docs/reference/components/ all
./gencomponentdocs ../website/i18n/zh/docusaurus-plugin-content-docs/current/reference/components/ all

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.97%. Comparing base (824bd8d) to head (6654fee).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6184      +/-   ##
==========================================
- Coverage   47.97%   47.97%   -0.01%     
==========================================
  Files         674      674              
  Lines       55841    55841              
==========================================
- Hits        26788    26787       -1     
- Misses      27305    27306       +1     
  Partials     1748     1748              

Flag	Coverage Δ
unittests	47.97% <ø> (-0.01%)	⬇️

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PR Overview

This PR refactors the gencomponentdocs tool to support generating documentation for all components at once rather than one by one.

• Refactored the main function to handle multiple commands.
• Added a new "all" module case that generates documentation for all karmada components.

Reviewed Changes

File	Description
hack/tools/gencomponentdocs/gen_component_docs.go	Refactored command generation to support the "all" module and improved error handling

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

hack/tools/gencomponentdocs/gen_component_docs.go:87

• [nitpick] Consider using context.TODO() instead of nil for the scheduler command to maintain consistency with the other commands that use context.TODO().

cmds = append(cmds, schapp.NewSchedulerCommand(nil))

hack/tools/gencomponentdocs/gen_component_docs.go:109

• Ensure that the new 'all' module functionality is covered by corresponding tests to verify that all commands are generated correctly.

case "all":