android: inject ExecOperations for Gradle 9 compatibility (#386)

RN 0.87 bumps the Gradle wrapper to 9.x, which removed Project.exec(). The
linkNodeApiModules task used the bare `exec {}` closure in its doLast action,
failing every Android build (and gradle.test.ts on all platforms) with
"Could not find method exec()". Inject the ExecOperations service via an
@Inject-annotated interface and call injectedExecOps.execOps.exec {} instead.

Greens the ubuntu and macOS unit-test lanes. Windows surfaces a separate,
pre-existing RN 0.87 / Gradle 9 issue (missing react-native/tmp projectDir)
tracked separately.

Author: kraenhansen

packages/host/android/build.gradle

@@ -1,6 +1,8 @@
 import java.nio.file.Paths
 import groovy.json.JsonSlurper
+import javax.inject.Inject
 import org.gradle.internal.os.OperatingSystem
+import org.gradle.process.ExecOperations
 
 if (!System.getenv("REACT_NATIVE_OVERRIDE_HERMES_DIR")) {
     throw new GradleException([
@@ -161,17 +163,25 @@ dependencies {
 def commandLinePrefix = OperatingSystem.current().isWindows() ? ["cmd", "/c", "node"] : []
 def cliPath = file("../bin/react-native-node-api.mjs")
 
+// Gradle 9 removed Project.exec(), so the ExecOperations service has to be
+// injected and used explicitly instead of the bare `exec {}` closure.
+interface InjectedExecOps {
+  @Inject
+  ExecOperations getExecOps()
+}
+def injectedExecOps = project.objects.newInstance(InjectedExecOps)
+
 // Custom task to fetch jniLibs paths via CLI
 task linkNodeApiModules {
   doLast {
-    exec {
+    injectedExecOps.execOps.exec {
       commandLine commandLinePrefix + [cliPath, 'link', '--android', rootProject.rootDir.absolutePath]
       standardOutput = System.out
       errorOutput = System.err
       // Enable color output
       environment "FORCE_COLOR", "1"
     }
-    
+
     android.sourceSets.main.jniLibs.srcDirs += file("../auto-linked/android").listFiles()
   }
 }