chore: automate Expo release version detection

[fadi-george]

Description

One Line Summary

Automatically detect the next Expo plugin release version while retaining an optional manual override.

Details

Motivation

Remove the need to manually determine and enter every release version, matching the release workflow used by the Flutter SDK.

Scope

Updates only the create-release PR workflow. It detects whether a release is needed, passes the resolved version through release preparation and version updates, and skips release work when no release is needed. No public API or runtime behavior changes.

Testing

Manual testing

• git diff --check passed.
• The pre-commit vp check --fix task passed.
• Device, Android, and iOS testing do not apply because this change only affects GitHub Actions release orchestration and cannot be fully executed locally.

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have personally tested this on my device, or explained why that is not possible
• I have tested this on the latest version of the plugin
• I have tested this on both Android and iOS, or explained why that is not possible

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

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