Assert Gradle wrapper version if one was requested

[aloubyansky]

This is a follow up to #49256 It adds an assertion on the generated Gradle wrapper version for tests.

This is how it looks in the logs

[INFO] Running io.quarkus.gradle.BasicMultiModuleQuarkusBuildTest
$ /home/aloubyansky/git/quarkus/integration-tests/gradle/./gradlew wrapper --gradle-version=8.14
$ /home/aloubyansky/git/quarkus/integration-tests/gradle/target/classes/basic-multi-module-project-wrapper-8.14/./gradlew --version

------------------------------------------------------------
Gradle 8.14
------------------------------------------------------------

Build time:    2025-04-25 09:29:08 UTC
Revision:      34c560e3be961658a6fbcd7170ec2443a228b109

Kotlin:        2.0.21
Groovy:        3.0.24
Ant:           Apache Ant(TM) version 1.10.15 compiled on August 25 2024
Launcher JVM:  17.0.12 (Oracle Corporation 17.0.12+8-LTS-286)
Daemon JVM:    /home/aloubyansky/jdk/jdk-17.0.12 (no JDK specified, using current Java home)
OS:            Linux 6.15.8-200.fc42.x86_64 amd64

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit d96d464.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.