fix: remove previewBranch parameter and align deploy stage condition

[jingjingjia-ms]

The deploy stage condition referenced a previewBranch parameter that became unnecessary after removing deploy_github. This caused the deploy stage to execute on previewBranch pushes while immediately skipping all jobs — confusing and misleading.

Changes

• Removed previewBranch parameter — no longer referenced anywhere in the pipeline
• Simplified deploy stage condition — now matches the deploy_maven job's condition exactly:

  # Before
  condition: and(or(contains(variables['build.sourceBranch'], 'refs/tags/v'), eq(variables['build.sourceBranch'], '${{ parameters.previewBranch }}')), succeeded())
  
  # After
  condition: and(contains(variables['build.sourceBranch'], 'refs/tags/v'), succeeded())

[Copilot]

Pull request overview

Removes the GitHub release deployment job from the CI build pipeline so that GitHub deployments are handled by the release process instead.

Changes:

• Deleted the deploy_github deployment job from the deploy stage in the Azure Pipelines CI definition.
• Left the Maven deployment (deploy_maven) as the remaining deployment job in the deploy stage.

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