[AMORO-4236] Add Maintenance tab for table process management

[zhangwl9]

Why are the changes needed?

Close #4236.

Brief change log

Introduces Maintenance tab in the table details page to separate maintenance processes (cleanup operations) from optimizing processes.

Key changes:

• Backend: Add processCategory parameter to getOptimizingProcessesInfo API to filter by OPTIMIZING or MAINTENANCE category
• Backend: Add new REST endpoint /maintenance-types to fetch maintenance-specific process types
• Backend: Update MixedAndIcebergTableDescriptor to support category-based filtering with proper type separation
• Frontend: Create reusable Maintenance.vue component that wraps Optimizing.vue with maintenance-specific configuration
• Frontend: Add processCategory and cancelModalTitleKey props to Optimizing.vue for flexible reuse
• Frontend: Register Maintenance tab in table details page alongside Optimizing tab

How was this patch tested?

• Add some test cases that check the changes thoroughly including negative and positive cases if possible

• Add screenshots for manual tests if appropriate

• Run test locally before making a pull request

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)