added tag retention tasks list subcommand

[NishchayRajput]

Description

Briefly describe what this pull request does and why the change is needed.
This PR adds the harbor tag retention tasks list subcommand to display retention execution tasks for a specific retention policy execution.

It enables users to view and inspect individual tasks from a retention policy execution, showing details such as task ID, repository, status, retention metrics, and timing information.

• Fixes feat: immutable tags update subcommand #802

Type of Change

Please select the relevant type.

• Bug fix
• New feature
• Documentation update
• Refactor
• Chore / maintenance

Changes

• Added harbor tag retention tasks command group under harbor tag retention.
• Added harbor tag retention tasks list [PROJECT_NAME] with:
  • Interactive mode (prompts for project and execution selection if not provided)
  • Flag-based mode with explicit project ID/name and execution ID
  • Table-based output with task details (ID, Execution ID, Repository, Status, Retained, Total, Code, Revision, Start Time, End Time)
  • JSON output format support via --output-format json
• Added retention API helpers:
  • ListRetentionExecutions() - fetch retention executions for a policy
  • ListRetentionTasks() - fetch tasks for a specific execution
• Added UI/View components:
  • RetentionExecutionList() - interactive selection view for executions
  • RetentionTaskList() - task details table view
• Added prompt helpers:
  • GetRetentionExecutionIDFromUser() - interactive execution selection

[codecov]

Codecov Report

❌ Patch coverage is 0% with 213 lines in your changes missing coverage. Please review.
✅ Project coverage is 8.50%. Comparing base (60ad0bd) to head (a8299ba).
⚠️ Report is 181 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/views/retention/tasks/view.go	0.00%	65 Missing ⚠️
pkg/views/retention/executions/view.go	0.00%	59 Missing ⚠️
cmd/harbor/root/tag/retention/tasks/list.go	0.00%	44 Missing ⚠️
pkg/api/retention_execution_handler.go	0.00%	16 Missing ⚠️
pkg/prompt/prompt.go	0.00%	13 Missing ⚠️
cmd/harbor/root/tag/retention/tasks/cmd.go	0.00%	9 Missing ⚠️
cmd/harbor/root/tag/retention/cmd.go	0.00%	5 Missing ⚠️
cmd/harbor/root/tag/retention/tasks.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #954      +/-   ##
=========================================
- Coverage   10.99%   8.50%   -2.49%     
=========================================
  Files         173     320     +147     
  Lines        8671   15953    +7282     
=========================================
+ Hits          953    1357     +404     
- Misses       7612   14470    +6858     
- Partials      106     126      +20     

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