improve AI generated release notes

[pk910]

rel #477

AI didn't get enough context to generate proper release notes from the branch names only.
I've extended the AI query by additional PR titles & descriptions and structured the query properly.
This version now generates proper notes (example for 1.19.0 release): [changeset]

release_notes<<EOF
* Added comprehensive v1 API endpoints with JWT authentication and rate limiting (#473)
* Introduced new UI pages for consolidation, withdrawal, and exit queue details (#474)
* Fixed endpoint URL issues and improved casing consistency (#471, #472)
* Added EL chain config handling and blob base fee calculation visualization (#467)
* Implemented optional validator summary page (#466)
EOF

release_notes<<EOF
* Implement comprehensive v1 API endpoints with JWT authentication and rate limiting (#473)
* Add new UI pages for consolidation/withdrawal/exit queue details (#474)
* Fix endpoint URL issues and casing (#471, #472)
* Add EL chain config handling and blob base fee visualization (#467)
* Dependency updates across UI and backend packages (#468, #469, #475, #476)
EOF

release_notes<<EOF
* Added new UI overview pages for consolidation, withdrawal, and exit queues with detailed stats and previews (#474)  
* Implemented comprehensive v1 API endpoints with advanced authentication and rate limiting (#473)  
* Enhanced Execution Layer (EL) chain config handling and visualization, including blob base fee calculations (#467)  
* Fixed endpoint URL casing and related issues (#471, #472)  
* Updated dependencies for improved stability and security (#468, #469, #475, #476)
EOF