Check Hermes override pre-condition from Host package when building for Android

[kraenhansen]

Ideally, we would have liked to inject the overriding of Hermes source directory from within, but haven't found a way to do that. Until we find a way we can assert that it's done by the caller.

Merging this PR will:

• Add a checkHermesOverride to the host package Gradle build script to ensure REACT_NATIVE_OVERRIDE_HERMES_DIR is set (fixing Sanity check of Hermes source directory via environment variable, when building Android projects #163).
• Drive-by add a test to verify the linkNodeApiModules task is calling into the CLI to execute auto-linking.
• Drive-by fix of calling into the CLI to link on Windows.

[kraenhansen]

Drafting this again, since it seems Gradle is having a hard time executing the CLI on Windows.

[Copilot]

Pull Request Overview

This PR adds validation and fixes for React Native Node-API's Android build process, specifically ensuring proper Hermes configuration and improving cross-platform compatibility.

• Adds a checkHermesOverride Gradle task to verify REACT_NATIVE_OVERRIDE_HERMES_DIR environment variable is set
• Fixes Windows compatibility for CLI auto-linking in Gradle builds
• Adds comprehensive test coverage for Gradle tasks and CLI functionality

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/host/android/build.gradle	Adds Hermes override validation task and fixes Windows CLI execution
packages/host/src/node/gradle.test.ts	New test file for Gradle task validation
packages/host/src/node/cli/bin.test.ts	New test file for CLI command validation
packages/host/package.json	Adds test script for Gradle-specific tests
.github/workflows/check.yml	Enables Gradle tests in CI environment
.changeset/silver-suits-double.md	Documents the Hermes override assertion feature
.changeset/many-candies-retire.md	Documents the Windows auto-linking fix

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[kraenhansen]

Pushed a fix for the failure to call into the CLI on Windows.