[CI] Use GVM to install Golang on Windows

[mrodm]

This PR replaces Chocolatey-based Go installation with GVM in Windows CI steps, matching the approach used in package-registry#1617.

The shared PowerShell functions (fixCRLF, ensureBinPath, withGolang) have been extracted into a new common_windows.ps1 file, dot-sourced by both unit_tests_windows.ps1 and stack_tests_windows.ps1.

Motivation

Chocolatey does not always have the latest Go patch versions available (e.g. 1.25.8 was missing), which blocks CI when .go-version is bumped. GVM downloads Go directly from the official releases, avoiding this dependency on Chocolatey's package update cycle.

The SETUP_GVM_VERSION environment variable was already defined in .buildkite/pipeline.yml.

Changes

• .buildkite/scripts/common_windows.ps1 (new): shared functions for CRLF fix, bin path setup, and GVM-based Go installation with retry logic.
• .buildkite/scripts/unit_tests_windows.ps1: removed duplicated functions, dot-sources common_windows.ps1.
• .buildkite/scripts/stack_tests_windows.ps1: removed duplicated functions, dot-sources common_windows.ps1. Docker/Docker Compose functions remain unchanged (still use Chocolatey).
• test/packages/parallel/system/: added missing error.message field definition.

Author's Checklist

• Verify Buildkite Windows CI step installs Go successfully via GVM.
• Confirm the installed Go version matches .go-version (e.g. updating to 1.25.8).
• Confirm stack and unit tests pass on the Windows step.
• Update system test package to include error.message field definition.

References

• Same approach as [CI] Use gvm on windows to install Golang package-registry#1617

---

Generated with the assistance of Cursor

[mrodm]

Added this field because of this error:

test case failed: one or more errors found in documents stored in metrics-system.process-96148 data stream: [0] field "error.message" is undefined

This is related to #3330 . Before the presence of this field error.message cause to fail the tests. As there is no event.kind , the field validator is executed and that field was not defined.

Example (buildkite link):

test case failed: one or more errors found in documents stored in metrics-system.process-63529 data stream: [0] found error.message in event: [non fatal error; reporting partial metrics: error fetching PID metrics for 1 processes, most likely a "permission denied" error. Enable debug logging to determine the exact cause.]

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 0147e14

Failed CI Steps

• :go: Integration test (with logstash): system_benchmark
• :go: Integration test (false positive): httpjson_false_positive_asserts

History

• 💚 Build #7464 succeeded 2938e8b
• 💚 Build #7463 succeeded 757ba56
• 💔 Build #7462 failed 61511fd
• 💔 Build #7461 failed 4048771

cc @mrodm

[teresaromero]

🪟 🚀