Improve CI pipeline

[velo]

  The new build-and-test.yml workflow structure:

  ┌─────────────────────────┐
  │   cache-dependencies    │  ← Downloads & caches Maven artifacts, extracts version info
  └───────────┬─────────────┘
              │
      ┌───────┴───────┐
      ▼               ▼
  ┌─────────┐   ┌──────────────────┐
  │unit-test│   │integration-test  │  ← Run in parallel
  └────┬────┘   └────────┬─────────┘
       │                 │
       └────────┬────────┘
                │
                ▼ (both must pass)
      ┌─────────┴─────────┐
      ▼                   ▼
  ┌────────┐         ┌─────────┐
  │ deploy │         │ uber-jar│  ← Run in parallel, skip tests
  └────────┘         └─────────┘

[Copilot]

Pull request overview

This PR consolidates three separate GitHub Actions workflows (deploy.yml, uber-jar.yml, and presumably an earlier build workflow) into a single, more efficient build-and-test.yml workflow. The new structure implements a dependency-based execution model where a shared cache-dependencies job feeds into parallel test jobs, which then gate the deployment and artifact generation jobs.

Key changes:

• Introduces a dependency caching strategy to avoid redundant Maven dependency downloads across jobs
• Separates unit and integration tests into parallel jobs for faster feedback
• Makes deploy and uber-jar jobs run in parallel after tests pass, with test skipping via -DskipTests

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
.github/workflows/uber-jar.yml	Removed standalone uber-jar workflow; functionality moved to build-and-test.yml
.github/workflows/deploy.yml	Removed standalone deploy workflow; functionality moved to build-and-test.yml
.github/workflows/build-and-test.yml	New consolidated workflow combining build, test, deploy, and uber-jar jobs with optimized dependency graph

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