adding release notes for 1.28.3

[grnmeira]

Description

Reviewers

• Ambient
• Docs
• Installation
• Networking
• Performance and Scalability
• Extensions and Telemetry
• Security
• Test and Release
• User Experience
• Developer Infrastructure
• Localization/Translation

[istio-policy-bot]

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[dhawton]

Given that the build just occurred, is this date accurate? Given the long running test duration and the upcoming weekend, wouldn't this be this coming Monday (the 18th)?

[fjglira]

small comment. Besides the Daniel comment the rest looks good to me

[dhawton]

The publish date still needs fixing before we can approve this.