Migrate release note generation to github in-built capability

[ThaminduDilshan]

Purpose

This pull request updates the release automation process by replacing the Release Drafter workflow with GitHub's native automatic release notes. The changes improve the maintainability and clarity of release notes, and ensure the release process uses the latest GitHub features.

Reference: https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes

Sample Format

## What's Changed

### ⚠️ Breaking Changes
* Remove deprecated OAuth v1 support by @developer1 in https://github.com/asgardeo/thunder/pull/145

### 🚀 Features
* Add SMS OTP authentication flow by @developer3 in https://github.com/asgardeo/thunder/pull/123

### ✨ Improvements
* Optimize database connection pooling for better performance by @developer6 in https://github.com/asgardeo/thunder/pull/130
* Enhance error messages in authentication flows by @developer7 in https://github.com/asgardeo/thunder/pull/136

### 🐛 Bug Fixes
* Fix race condition in token refresh flow by @developer9 in https://github.com/asgardeo/thunder/pull/125

### 📝 Other Changes
* Update Helm chart to v1.5 with new configuration options by @developer18 in https://github.com/asgardeo/thunder/pull/131
* Add build script for cross-platform compilation by @developer21 in https://github.com/asgardeo/thunder/pull/127

## New Contributors
* @developer4 made their first contribution in https://github.com/asgardeo/thunder/pull/128
* @developer12 made their first contribution in https://github.com/asgardeo/thunder/pull/129

**Full Changelog**: https://github.com/asgardeo/thunder/compare/v0.18.0...v0.19.0

Example

[Copilot]

Pull Request Overview

This pull request modernizes the release automation process by migrating from Release Drafter to GitHub's native automatic release notes feature, while expanding label support for better categorization of changes.

• Replaces Release Drafter workflow with GitHub's built-in automatic release notes generation
• Adds support for documentation, testing, infrastructure, and tooling labels
• Improves release note generation logic with better handling of first releases and previous release detection

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/release-builder.yml	Replaces Release Drafter with GitHub Script action for automatic release notes generation
.github/workflows/pr-label-check.yml	Adds new label types for documentation, testing, infrastructure, and tooling
.github/release.yml	New configuration file for GitHub's automatic release notes with categorized labels
.github/release-drafter.yml	Removes deprecated Release Drafter configuration file

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.16%. Comparing base (02f4f8e) to head (911d4b4).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #548   +/-   ##
=======================================
  Coverage   61.16%   61.16%           
=======================================
  Files         149      149           
  Lines       19071    19071           
=======================================
  Hits        11665    11665           
  Misses       6103     6103           
  Partials     1303     1303           

Flag	Coverage Δ
backend-combined-postgres	52.18% <ø> (ø)
backend-combined-sqlite	52.18% <ø> (ø)
backend-integration-postgres	52.18% <ø> (ø)
backend-integration-sqlite	52.18% <ø> (ø)
backend-unit	20.51% <ø> (ø)

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[darshanasbg]

Can you share a sample release done with this release note drafter?

[ThaminduDilshan]

Can you share a sample release done with this release note drafter?

https://github.com/ThaminduDilshan/thunder/releases/tag/v0.20.0