Add Windows CI testing

[vbabanin]

• Add Windows 2022 Evergreen build variants for server 8.2 across all topologies to enable Windows CI coverage
• Add EnvironmentProvider class to centralize all System.getenv() calls, replacing the reflection-based env var override hack that fails on Windows due to JDK's ProcessEnvironment dual-map architecture
• Fix SSL keystore/truststore paths in Evergreen scripts to use native Windows paths via cygpath
• Fix JSON test file path separator handling and mongocryptd temp directory for Windows compatibility
• Skip Unix-domain-socket test on Windows

JAVA-6057

[Copilot]

Pull request overview

Adds Windows CI coverage and improves Windows compatibility across tests and Evergreen configuration by standardizing environment-variable access and fixing platform-specific path handling.

Changes:

• Add Windows 2022 Evergreen build variants (server 8.2) and Windows-specific path handling in Evergreen scripts.
• Introduce EnvironmentProvider to centralize env var access and enable test-time overrides without reflection hacks.
• Fix Windows compatibility issues in tests (temp dirs, path separators) and skip a non-portable socket test on Windows.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
driver-sync/src/test/functional/com/mongodb/client/AbstractSessionsProseTest.java	Write mongocryptd logs to Java temp dir for cross-platform support.
driver-sync/src/test/functional/com/mongodb/client/AbstractMicrometerProseTest.java	Replace reflective env-var mutation with EnvironmentProvider overrides in micrometer prose tests.
driver-core/src/test/unit/com/mongodb/internal/EnvironmentProviderTest.java	Add unit tests for env lookup/override behavior.
driver-core/src/test/functional/com/mongodb/internal/connection/SocketStreamHelperSpecification.groovy	Skip a socket configuration test on Windows.
driver-core/src/test/functional/com/mongodb/internal/connection/FaasEnvironmentAccessor.java	Remove test-only accessor for env overrides (superseded by EnvironmentProvider).
driver-core/src/test/functional/com/mongodb/internal/connection/ClientMetadataTest.java	Update .dockerenv path to match production logic and be OS-correct.
driver-core/src/test/functional/com/mongodb/client/WithWrapper.java	Switch env-var test wrapper to EnvironmentProvider.envOverride().
driver-core/src/main/com/mongodb/internal/observability/micrometer/TracingManager.java	Use EnvironmentProvider.getEnv for observability env vars.
driver-core/src/main/com/mongodb/internal/observability/micrometer/MicrometerTracer.java	Use EnvironmentProvider.getEnv for query text length env var.
driver-core/src/main/com/mongodb/internal/EnvironmentProvider.java	New centralized env var provider + override mechanism for tests.
driver-core/src/main/com/mongodb/internal/connection/OidcAuthenticator.java	Read OIDC-related env vars via EnvironmentProvider.
driver-core/src/main/com/mongodb/internal/connection/FaasEnvironment.java	Delegate env var reads to EnvironmentProvider (removing test override map).
driver-core/src/main/com/mongodb/internal/authentication/BuiltInAwsCredentialSupplier.java	Read AWS env vars via EnvironmentProvider.
bson/src/test/unit/util/JsonPoweredTestHelper.java	Normalize path separators to reliably locate JSON spec files on Windows.
.evergreen/setup-env.bash	Add Windows-specific JDK paths for Evergreen.
.evergreen/run-tests.sh	Use native Windows paths for SSL keystore/truststore and log Windows version.
.evergreen/run-csfle-tests-with-mongocryptd.sh	Use native Windows paths for SSL keystore/truststore.
.evergreen/.evg.yml	Add Windows axes/buildvariants and introduce MongoDB 8.2 for Windows coverage.

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[Copilot]

On Windows, the JDK paths are switched to /cygdrive/c/..., but JDK21_GRAALVM remains hard-coded to a Linux path later in this script. If any Windows variants ever run the GraalVM native-image task, this will break. Consider applying the same OS switch for JDK21_GRAALVM (or documenting/enforcing that GraalVM tasks never run on Windows).

Suggested change

	else
	export JDK8="/opt/java/jdk8"
	export JDK11="/opt/java/jdk11"
	export JDK17="/opt/java/jdk17"
	export JDK21="/opt/java/jdk21"
	fi
	# note that `JDK21_GRAALVM` is used in `run-graalvm-native-image-app.sh`
	# by dynamically constructing the variable name
	export JDK21_GRAALVM="/opt/java/jdk21-graalce"
	# note that `JDK21_GRAALVM` is used in `run-graalvm-native-image-app.sh`
	# by dynamically constructing the variable name
	export JDK21_GRAALVM="/cygdrive/c/java/jdk21-graalce"
	else
	export JDK8="/opt/java/jdk8"
	export JDK11="/opt/java/jdk11"
	export JDK17="/opt/java/jdk17"
	export JDK21="/opt/java/jdk21"
	# note that `JDK21_GRAALVM` is used in `run-graalvm-native-image-app.sh`
	# by dynamically constructing the variable name
	export JDK21_GRAALVM="/opt/java/jdk21-graalce"
	fi