fix(terraform): update deprecated endpoint parameter to endpoints.s3

[sprajeesh]

Replace the deprecated 'endpoint' parameter with 'endpoints.s3' in the S3 backend configuration to align with newer Terraform versions and eliminate deprecation warnings. Also ensure terraform init uses -migrate-state without -input=false to properly handle state migrations interactively.

Summary by CodeRabbit

• Documentation
  • Clarified Terraform backend setup guidance for the S3 endpoint configuration.
• Chores
  • Updated the initialization workflow to use the current backend configuration key for S3, aligning automation with the latest Terraform requirements.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 7ef68f84-299d-42c3-820b-518f243252b3

📥 Commits

Reviewing files that changed from the base of the PR and between df29b45 and ef0a7b5.

📒 Files selected for processing (2)

• .github/workflows/push.yml
• infra/oci/backend.tf

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📝 Walkthrough

Walkthrough

Updates the Terraform S3 backend configuration key used during terraform init in the CI workflow from endpoint to endpoints.s3, and updates accompanying comments in backend.tf documenting the deprecated key and new naming.

Changes

Backend Endpoint Key Update

Layer / File(s)	Summary
Update backend-config key and docs .github/workflows/push.yml, infra/oci/backend.tf	Renames the S3 backend-config parameter from endpoint to endpoints.s3 in the CI workflow and updates comments in backend.tf noting the deprecated key and new naming.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: replacing the deprecated Terraform backend endpoint parameter with endpoints.s3.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix--terraform-s3-backend-endpoints

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