feat: add robust error-on-missing-globs configuration #5455

[vikash7485]

Resolves #5455.

This PR introduces the error-on-missing-globs flag, allowing users to configure Pixi to halt task execution with an error instead of a soft warning when input or output globs match no files.

Key Changes:

• pixi_manifest/src/task.rs: Added the new error_on_missing_globs boolean flag to the Execute task definition, serialized appropriately in kebab-case.
• pixi_config/src/lib.rs: Added error_on_missing_globs field to the global Config struct (accessible under [project] or [workspace]), including merging precedence logic.
• pixi_task & pixi_cli: Transformed warn_on_missing_globs into check_missing_globs which evaluates the new flag logic dynamically, returning an explicit fatal miette::Result error to effectively bubble up failure when glob resolutions strictly yield 0 hits.
• Unit Test Coverage: Added a comprehensive unit test in pixi_task/src/executable_task.rs to rigorously ensure check_missing_globs panics accurately with the exact error string.

User Scenarios this supports:

With this configuration, users can now rigorously enforce checks for artifact presence, resolving instances where typoes in target blobs (such as inpt.txt vs input.txt) unexpectedly lead to tasks incorrectly performing downstream logic.