revert: separate update-analytics and deploy jobs to restore original…

[shawnthompson]

… workflow structure

• Reverted previous consolidation of update-analytics and deploy jobs back into separate jobs
• Added push event trigger for the deploy job to ensure deployment runs automatically for every commit to main
• Removed complex conditions for deployment on pull request merges in favor of simpler push trigger
• Restored permissions setup (contents: write) to allow pushing to gh-pages branch
• Switched back to explicit steps for each job, simplifying and clarifying workflow management

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