Improve release script reliability (ENG-1733)

[oschwald]

Summary

• Add pre-flight checks to verify tools and connectivity before making any changes
• Support pre-release versions (e.g., 1.0.0-beta.1) in changelog parsing

Pre-flight checks added

• Verify gh CLI is authenticated
• Verify repository access via gh
• Verify git can connect to remote (catches SSH/credential issues)
• Check required commands: perl, rake

Changes

1. Added pre-flight check block at the start of the script
2. Updated version regex to support pre-release suffixes like -beta.1

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