Add drag-and-drop file import and multi-format template export to OasisSubmitter

[Mbeaulne]

Description

Added drag-and-drop file import functionality to the Oasis submitter and expanded template export options. Users can now drag files directly onto the submit button area to automatically open the arguments dialog with imported values. The template download feature now supports CSV, JSON, and YAML formats through a dropdown menu.

Related Issue and Pull requests

Type of Change

• New feature
• Improvement

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Test Instructions

1. Navigate to a pipeline with configurable inputs
2. Test drag-and-drop functionality:
   • Drag a CSV, JSON, or YAML file onto the submit button area
   • Verify the area highlights when dragging over it
   • Confirm the arguments dialog opens with imported values
3. Test template export:
   • Click the "Template" dropdown button
   • Verify CSV, JSON, and YAML options are available
   • Download each format and verify content is correctly formatted
4. Test bulk input handling:
   • Set some inputs as bulk and verify templates expand correctly
   • Import files with bulk data and confirm proper parsing

Additional Comments

The refactor consolidates template generation logic into a single utility file with comprehensive test coverage. The drag-and-drop implementation uses proper event handling with drag counters to avoid flickering during nested element traversal.

[github-actions]

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[Mbeaulne]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Refactor file extension extraction and consolidate test helpers #1896
• Add drag-and-drop file import and multi-format template export to OasisSubmitter #1895 👈 (View in Graphite)
• Add YAML file import support to task arguments dialog #1894
• Add JSON file import support to task arguments dialog #1892
• Add CSV import/export functionality to task arguments dialog #1890
• Add bulk submission support to OasisSubmitter with comma-separated input values #1889
• master

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