test(spring-boot): Move the Boot 2 sample's tests into the module

Adds an integrationTest suite to sentry-spring-boot that mirrors the
jakarta one and ports the Boot 2 sample's Person, DistributedTracing,
Todo, Cache and Metrics tests to it. Spring Boot 2 has no RestClient,
so the tracing forwards through RestTemplate and Todo covers three
clients, and WebClient is called on the request thread because Reactor
3.4 lacks automatic context propagation. The Person test is the jakarta
one, which also checks the logged error and a span's feature flag that
the Boot 2 sample never asserted.

The Spring Boot 2 matrix runs the suite from 2.4 to 2.7. Below 2.7 the
sample's remaining GraphQL and Kafka tests are excluded, so its
systemTest no longer fails on finding none.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: runningcode

.github/workflows/spring-boot-2-matrix.yml

@@ -87,6 +87,9 @@ jobs:
             :sentry-samples:sentry-samples-spring:testClasses \
             :sentry-opentelemetry:sentry-opentelemetry-agent:assemble
 
+      - name: Test sentry-spring-boot integration suite
+        run: ./gradlew :sentry-spring-boot:integrationTest
+
       - name: Test sentry-samples-spring-boot
         run: |
           python3 test/system-test-runner.py test \

sentry-samples/sentry-samples-spring-boot/build.gradle.kts

@@ -154,6 +154,8 @@ tasks.register<Test>("systemTest").configure {
     if (!includeKafka) {
       excludeTestsMatching("io.sentry.systemtest.Kafka*")
     }
+    // The other tests moved into sentry-spring-boot, so without GraphQL and Kafka none are left.
+    isFailOnNoMatchingTests = includeGraphql || includeKafka
   }
 }