Add Spring Boot 3 test

Author: smowton

java/ql/integration-tests/all-platforms/java/spring-boot-sample/.gitattributes

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+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# These are explicitly windows files and should use crlf
+*.bat           text eol=crlf
+

java/ql/integration-tests/all-platforms/java/spring-boot-sample/.gitignore

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+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/

java/ql/integration-tests/all-platforms/java/spring-boot-sample/README

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+Generated using start.spring.io, using Java 17 and Spring Boot 3.2.5.
+
+I also added a JSR305 dependency to circumvent a harmless database inconsistency that arose because annotations on Spring Core classes weren't included in the compile classpath (the Java extractor touches more classes than actual compilation)

java/ql/integration-tests/all-platforms/java/spring-boot-sample/build.gradle

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+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.2.5'
+	id 'io.spring.dependency-management' version '1.1.4'
+}
+
+group = 'com.github'
+version = '0.0.1-SNAPSHOT'
+
+// The generated sample would explicitly set sourceCompatibility to Java 17 here,
+// but I omit it to test we recognise the Spring Boot plugin version.
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+        implementation 'com.google.code.findbugs:jsr305:3.0.2'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}

java/ql/integration-tests/all-platforms/java/spring-boot-sample/force_sequential_test_execution

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+# We currently have a bug where gradle tests become flaky when executed in parallel
+# - sometimes, gradle fails to connect to the gradle daemon.
+# Therefore, force this test to run sequentially.

java/ql/integration-tests/all-platforms/java/spring-boot-sample/gradle/wrapper/gradle-wrapper.jar

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists