LINBEE-21919 - gracefully exit checkout workflow on gitStream when branch deleted

[yeelali14]

✨ PR Description

Purpose: Fix checkout workflow failures in gitStream when pull request head branch has been deleted by adding graceful fallback handling and error recovery.
Main changes:

• Added error handling to git fetch and checkout operations with fallback commands using || true to prevent workflow termination on deleted branches
• Updated @linearb/gitstream-core dependency from 2.1.244 to 2.1.244-10 to support improved branch deletion scenarios
• Added warning message when upstream head branch fetch fails to provide visibility into branch deletion events

Generated by LinearB AI and added by gitStream.
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[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	OSS Licenses	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[gitstream-cm]

✨ PR Review

The PR implements error handling for git operations to gracefully handle deleted branches, but the error suppression approach is overly broad and could mask legitimate issues.

1 issues detected:

🐞 Bug - Blanket error suppression masks legitimate git errors beyond just deleted branches.

Details: The use of || true on git checkout operations suppresses all errors, not just those related to deleted branches. This could hide legitimate git configuration issues, permission problems, or other failures that should be addressed, making debugging difficult and potentially allowing the workflow to continue in an inconsistent state.
File: action.yml

Generated by LinearB AI and added by gitStream.
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