chore(test): Increase performance of t-harness tests

[matthewmcneely]

Description

This PR significantly improves performance of "t"-based testing in Dgraph

1. Removes Docker container address resolution from the testutil init() function (any package that imports would block waiting for container addresses that weren't established yet). Instead, the PR introduces a lazy-loading concept that sync.Once's the address resolution. This saves about 20 seconds per test invocation from t
2. Parallel-izes the resolution of expected container addresses
3. Parallel-izes the health and login flows
4. Suppresses health-check and login warnings until after a reasonable threshold of failures (these checks constantly pollute the logs)
5. On non-Linux system, informs the user about DGRAPH_BINARY settings that can let tests proceed.
6. Upgrades the warp runner for the core tests to the 16x instance (core tests are the most comprehensive tests)

In general (on my M4) many tests improve time to complete by a factor of 3.

Checklist

• Code compiles correctly and linting passes locally

[Copilot]

Pull Request Overview

This PR introduces lazy initialization of Docker container addresses to improve performance of test harness execution. The changes move from global variable initialization to a thread-safe, on-demand address resolution pattern that supports concurrent address lookups and provides fallback values when Docker isn't available.

• Replaces direct global variable access with getter functions that ensure addresses are initialized
• Implements concurrent address resolution using goroutines and sync.WaitGroup for faster startup
• Adds fallback default addresses when Docker containers are not available

Reviewed Changes

Copilot reviewed 54 out of 54 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
testutil/client.go	Core refactoring: converts global variables to private with lazy initialization, adds getter functions, implements concurrent address resolution
Multiple test files	Updates all test files to use new getter functions instead of direct global variable access
testutil/minio.go	Adds MaxRetries configuration for improved reliability
t/t.go	Adds concurrent health checking for cluster startup and GOPATH validation
dgraph/docker-compose.yml	Improves GOPATH environment variable validation with error messages

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[trunk-io]

     

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