DOPS-236: Build cortex unity v4 on main branch

[QuyetThangNguyen]

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[atlassian]

The issue is ready for review, and the acceptance criteria have been met:

• ✅ Update unity plugin v4 to use Cortex on main branch

Check Jira issue

[Copilot]

Pull request overview

Updates the Jenkins declarative pipeline to build against the Cortex Unity main job and adds upstream triggering so this plugin pipeline can automatically run after Cortex builds succeed.

Changes:

• Switch non-product Cortex dependency resolution from develop to main.
• Add an upstream trigger (Cortex → this pipeline) based on the current branch name.
• Tighten when conditions for develop and release/** stages by requiring specific build causes, and remove the dedicated master stage.

Suppressed comments (1)

.jenkins/application/Jenkinsfile:117

• Same as the develop stage: excluding BranchIndexingCause means a newly-discovered release/** branch may not run this build stage on its first indexed build.

                    anyOf {
                        triggeredBy 'UserIdCause'
                        triggeredBy 'UpstreamCause'
                        triggeredBy 'BranchEventCause'
                    }

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