Add trigger control step to workflow documentation

[vim-zz]

✨ PR Description

Purpose and impact:
This PR adds a Trigger Control step to the gitStream workflow, enhancing control over automation execution.

Main changes:

• Introduces a Trigger Control step to evaluate whether to proceed with handling PR events
• Updates the sequence diagram to include the new Trigger Control step
• Adds a reference to the Execution Model documentation for more details on configuration

Generated by LinearB AI and added by gitStream.
_{AI-generated content may contain inaccuracies. Please verify before using. We'd love your feedback! 🚀}

[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	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]

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• GitHub Copilot
• Cursor
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• No AI tools were used

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Review dismissed

[MishaKav]

LG

[gitstream-cm]

✨ PR Review

LGTM

Generated by LinearB AI and added by gitStream.
_{AI-generated content may contain inaccuracies. Please verify before using. We'd love your feedback! 🚀}