feat: display arguments values in input nodes in run view

[maxy-shpfy]

Description

Closes https://github.com/Shopify/oasis-frontend/issues/414

Added support for displaying task arguments in the IO Node and Input Value Editor. This enhancement allows users to see when a pipeline input has been overridden with an argument value, clearly indicating when a value is not the default.

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

Test Instructions

Screen Recording 2026-01-09 at 4.59.02 PM.mov (uploaded via Graphite)

1. Create and run a pipeline with various input arguments - you can use http://localhost:8000/docs#/pipelineRuns/create_api_pipeline_runs__post (or replace origin with proper host/port)
2. Verify that the IO nodes display the argument values instead of defaults
3. Confirm that the Input Value Editor shows the argument value and correctly indicates when a value is not the default

Additional Comments

This change extracts the getArgumentValue function into a separate utility file for reuse and adds conditional rendering of the "Use as default" indicator based on whether the current value is an argument override.

[maxy-shpfy]

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

• feat: submit run with arguments #1618
• fix: call rerun pipeline with actual task arguments #1615
• feat: display arguments values in input nodes in run view #1612 👈 (View in Graphite)
• feat: display taskspec arguments values in run view #1611
• master

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