fix(updater): Pass OriginalTag to post-update script on second run

[vaind]

Summary

Fixes a bug where the OriginalTag parameter was not passed to the post-update script on the second run of update-dependency.ps1 in the updater action.

Problem

When the updater creates a new PR and runs the update-dependency script a second time (at the "After new PR: redo the update" step), it only passed the -Tag parameter but not the -OriginalTag parameter. This violated the script's validation requirement that when Tag is set, OriginalTag must also be provided (see update-dependency.ps1:258).

Solution

• Updated action.yml:291 to pass -OriginalTag '${{ steps.target.outputs.originalTag }}' on the second run
• Added unit test to verify the script works correctly when both Tag and OriginalTag are explicitly provided
• Added validation test to ensure the script fails appropriately when Tag is provided without OriginalTag

Test Plan

• All 34 existing unit tests pass
• New test validates explicit Tag/OriginalTag parameter passing
• Validation test confirms proper error handling

🤖 Generated with Claude Code

[seer-by-sentry]

Potential bug: The script uses lowercase variables $tag and $originalTag, but the parameters are defined as $Tag and $OriginalTag, leading to incorrect behavior.

• Description: In the execution path where Tag and OriginalTag are explicitly provided, the script attempts to use lowercase variables $tag and $originalTag. However, these variables are not defined in this scope; the correct, case-sensitive parameters are $Tag and $OriginalTag. Because PowerShell treats undefined variables as empty strings, the call to DependencyConfig 'set-version' $tag will incorrectly update the dependency file with an empty version. Additionally, the post-update script will be called with empty parameters, causing the dependency update process to fail or produce incorrect results. This bug occurs specifically in the new scenario introduced by the code change.

• Suggested fix: Correct the variable names used in the core functionality to match the case of the defined parameters. Change $tag to $Tag and $originalTag to $OriginalTag where they are used to call DependencyConfig and the post-update script.
  _{severity: 0.85, confidence: 0.98}

_{Did we get this right? 👍 / 👎 to inform future reviews.}