chore: Add "Sync GH Checks" utility job

[ncreated]

What and why?

📦 This PR adds utility job a the end of every CI pipeline. It will be listed in "status checks" required for PR to be merged.

How?

After this is merged, this job should be listed as the only job in:

Review checklist

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration)
• [ ] Make sure each commit and the PR mention the Issue number or JIRA reference
• [ ] Add CHANGELOG entry for user facing changes

[datadog-datadog-prod-us1[bot]]

Datadog Report

Branch report: ncreated/chore/add-ci-check-sync-job Commit report: d9bf992 Test service: dd-sdk-ios

:white_check_mark: 0 Failed, 3468 Passed, 0 Skipped, 2m 17.88s Total Time :small_red_triangle_down: Test Sessions change in coverage: 4 decreased, 1 increased (+0.02%), 9 no change

:small_red_triangle_down: Code Coverage Decreases vs Default Branch (4)

• test DatadogCoreTests iOS 72.62% (-0.08%) - Details
• test DatadogInternalTests iOS 79.48% (-0.03%) - Details
• test DatadogSessionReplayTests iOS 30.62% (-0.03%) - Details
• test DatadogCrashReportingTests iOS 26.77% (-0.02%) - Details