Fix conditional input paths handling for Argo DAG generation

[devendrakushwah80]

This PR fixes an issue where unresolved {{tasks.*}} expressions
were passed into Argo DAG input paths, causing ReplaceStrict failures.

Changes:

• Filter unresolved template expressions in conditional_input_paths.py
• Handle conditional paths earlier during DAG generation

Result:

• Prevents workflow requeue loops
• Ensures only resolved input paths are used

[greptile-apps]

Greptile Summary

The PR changes Argo DAG input-path generation so conditional parent task IDs are resolved through Argo expressions before unresolved or empty paths are removed.

• Builds expression-aware input paths for conditional DAG parents.
• Filters unresolved templates and paths whose task-ID segment is empty.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
metaflow/plugins/argo/argo_workflows.py	Generates status-aware task-ID expressions for conditional parents while retaining the existing compressed representation for ordinary parents.
metaflow/plugins/argo/conditional_input_paths.py	Filters unresolved template expressions and empty task-ID path segments before selecting conditional inputs.

_{Reviews (5): Last reviewed commit: "git push origin fix-argo-conditional-inp..." | Re-trigger Greptile}

[Shriprasad-P]

Review

PR: Fix conditional input paths handling for Argo DAG generation

Touched: metaflow/plugins/argo/argo_workflows.py, metaflow/plugins/argo/conditional_input_paths.py

• Addresses a concrete correctness/reliability issue based on the title and diff.
• CI/tooling change — confirm the pipeline still passes on this branch.
• Size looks manageable (+37/-12).

Commenting as a drive-by reviewer after reading the diff. Happy to look again if maintainers want a deeper pass on a specific file.