Migrate composite GitHub Actions from java-common-libs to ci-core

[Copilot]

Migrates two composite actions from opencb/java-common-libs (branch TASK-8067) to centralize CI/CD components in this repository.

Actions Migrated

• setup-java-maven: Sets up JDK, clones/compiles dependencies, configures Maven cache with dependency-aware keys
• test-summary: Parses Surefire XML reports and generates markdown test summaries with per-module breakdowns

Changes

• Copied complete action implementations preserving all logic, comments, and formatting
• Fixed cache key to fallback to github.sha when no dependencies provided (improves robustness for workflows without dependency repos)
• Updated README with usage examples for both actions

Patch for java-common-libs

Includes java-common-libs-updates.patch that updates 4 action references across 3 workflows to use:

uses: opencb/ci-core/.github/actions/setup-java-maven@main
uses: opencb/ci-core/.github/actions/test-summary@main

Apply instructions in MIGRATION_INSTRUCTIONS.md. The patch must be applied to opencb/java-common-libs branch TASK-8067 separately.

Usage Example

- name: Setup Java and Maven
  uses: opencb/ci-core/.github/actions/setup-java-maven@main
  with:
    java_version: '11'
    dependency_repos: 'java-common-libs,biodata'
    
- name: Generate Test Summary
  uses: opencb/ci-core/.github/actions/test-summary@main
  with:
    report_paths: './**/surefire-reports/TEST-*.xml'

Original prompt

migrate two composite GitHub Actions from the repository opencb/java-common-libs into this new repository (ci-core).

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