Allow overriding user agent for REST Client Reactive

[michalszynkiewicz]

fixes #23966

[quarkus-bot]

This workflow status is outdated as a new workflow run has been triggered.

Failing Jobs - Building ec4e267

Status	Name	Step	Failures	Logs	Raw logs
✖	MicroProfile TCKs Tests	Download Maven Repo	⚠️ Check →	Logs	Raw logs
✖	Native Tests - Data1	Download Maven Repo	⚠️ Check →	Logs	Raw logs

[quarkus-bot]

Failing Jobs - Building ec4e267

Status	Name	Step	Failures	Logs	Raw logs
✖	JVM Tests - JDK 11	Build	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 17

Full information is available in the Build summary check run.

Failures

⚙️ JVM Tests - JDK 11 #

- Failing: extensions/jdbc/jdbc-mssql/deployment 
! Skipped: integration-tests/jpa-mssql 

📦 extensions/jdbc/jdbc-mssql/deployment

✖ io.quarkus.jdbc.mssql.deployment.DevServicesMsSQLDatasourceTestCase. - More details - Source on GitHub

java.lang.RuntimeException: 
java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.datasource.deployment.devservices.DevServicesDatasourceProcessor#launchDatabases threw an exception: java.lang.RuntimeException: org.testcontainers.containers.ContainerLaunchException: Container startup failed

[michalszynkiewicz]

the failures are not related