[CI] Run Agentbeat integration tests on Windows 2022

[ycombinator]

Currently, we run Agentbeat integration tests only on Linux:

beats/.buildkite/x-pack/pipeline.xpack.agentbeat.yml

Lines 61 to 95 in 138e43c

	- label: ":linux: Agentbeat/Integration tests Linux"
	key: "agentbeat-it-linux"
	depends_on:
	- agentbeat-package-linux
	env:
	ASDF_NODEJS_VERSION: 18.17.1
	PLATFORMS: "+all linux/amd64 linux/arm64 windows/amd64 darwin/amd64 darwin/arm64"
	SNAPSHOT: true
	command: |
	set -euo pipefail
	echo "~~~ Downloading artifacts"
	buildkite-agent artifact download x-pack/agentbeat/build/distributions/** . --step 'agentbeat-package-linux'
	ls -lah x-pack/agentbeat/build/distributions/
	echo "~~~ Installing @elastic/synthetics with npm"
	npm install -g @elastic/synthetics
	echo "~~~ Running tests"
	cd x-pack/agentbeat
	mage goIntegTest
	artifact_paths:
	- x-pack/agentbeat/build/distributions/**/*
	- "x-pack/agentbeat/build/*.xml"
	- "x-pack/agentbeat/build/*.json"
	retry:
	automatic:
	- limit: 1
	timeout_in_minutes: 60
	agents:
	provider: "gcp"
	image: "${IMAGE_UBUNTU_X86_64}"
	machineType: "${GCP_HI_PERF_MACHINE_TYPE}"
	disk_size: 100
	disk_type: "pd-ssd"
	notify:
	- github_commit_status:
	context: "agentbeat: Integration tests"

This has led to at least one Windows-specific bug not being detected in Beats CI, which led to this revert PR: #41009.

We should also run Agentbeat integration tests on Windows, specifically Windows 2022 as Elastic Agent integration tests run on this platform in CI.

[botelastic]

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