Isolate Spring Boot <3.5 apps in smoke-tests subprojects for Gradle 9 compatibility

dd-smoke-tests/apm-tracing-disabled/application/build.gradle

@@ -0,0 +1,38 @@
+plugins {
+  id 'java'
+  id 'org.springframework.boot' version '2.7.15'
+  id 'io.spring.dependency-management' version '1.0.15.RELEASE'
+}
+
+def sharedRootDir = "$rootDir/../../../"
+def sharedConfigDirectory = "$sharedRootDir/gradle"
+rootProject.ext.sharedConfigDirectory = sharedConfigDirectory
+
+apply from: "$sharedConfigDirectory/repositories.gradle"
+
+if (hasProperty('appBuildDir')) {
+  buildDir = property('appBuildDir')
+}
+
+version = ""
+
+java {
+  sourceCompatibility = '1.8'
+}
+
+if (hasProperty('apiJar')) {
+  dependencies {
+    implementation files(property('apiJar'))
+  }
+} else {
+  dependencies {
+    implementation "com.datadoghq:dd-trace-api:+"
+  }
+}
+
+dependencies {
+  compileOnly 'com.github.spotbugs:spotbugs-annotations:4.9.8'
+  implementation 'org.springframework.boot:spring-boot-starter-web'
+  implementation group: 'io.opentracing', name: 'opentracing-api', version: '0.32.0'
+  implementation group: 'io.opentracing', name: 'opentracing-util', version: '0.32.0'
+}

dd-smoke-tests/apm-tracing-disabled/application/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,8 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionSha256Sum=6f74b601422d6d6fc4e1f9a1ab6522f642c2fdcbc15ae33ebd30ba3d7198e854
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

dd-smoke-tests/apm-tracing-disabled/application/settings.gradle

@@ -0,0 +1,32 @@
+pluginManagement {
+  repositories {
+    mavenLocal()
+    if (settings.hasProperty("gradlePluginProxy")) {
+      maven {
+        url settings["gradlePluginProxy"]
+        allowInsecureProtocol = true
+      }
+    }
+    if (settings.hasProperty("mavenRepositoryProxy")) {
+      maven {
+        url settings["mavenRepositoryProxy"]
+        allowInsecureProtocol = true
+      }
+    }
+    gradlePluginPortal()
+    mavenCentral()
+  }
+}
+
+def isCI = providers.environmentVariable("CI").isPresent()
+
+if (isCI) {
+  def sharedRootDir = "$rootDir/../../../"
+  buildCache {
+    local {
+      directory = "$sharedRootDir/workspace/build-cache"
+    }
+  }
+}
+
+rootProject.name='apm-tracing-disabled-smoketest'