Add support for downloading list of files in REST Client

[geoand]

• Closes: REST Client: support download multiple files multipart/form-data #41978

[gastaldi]

Hm, test failures may be related to this change?

[geoand]

I don't think so, but I'll rebase for good measure

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit e2452d1.

Failing Jobs

Status	Name	Step	Failures	Logs	Raw logs	Build scan
✔️	JVM Tests - JDK 17			Logs	Raw logs	🚧
✔️	JVM Tests - JDK 21			Logs	Raw logs	🚧
✔️	JVM Tests - JDK 17 Windows		Failures	Logs	Raw logs	🔍

You can consult the Develocity build scans.

Failures

⚙️ JVM Tests - JDK 17 Windows #

- Failing: integration-tests/rest-client-reactive 

📦 integration-tests/rest-client-reactive

✖ Failed to execute goal uk.co.automatictester:truststore-maven-plugin:3.0.0:generate-truststore (self-signed-truststore) on project quarkus-integration-test-rest-client-reactive: Execution self-signed-truststore of goal uk.co.automatictester:truststore-maven-plugin:3.0.0:generate-truststore failed: java.net.ConnectException: Connection timed out: connect

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 17 Windows

📦 integration-tests/rest-client

✖ io.quarkus.it.rest.client.wronghost.ExternalWrongHostUsingHostnameVerifierTestCase.restClient - History

• Read timed out - java.net.SocketTimeoutException

java.net.SocketTimeoutException: Read timed out
	at java.base/sun.nio.ch.NioSocketImpl.timedRead(NioSocketImpl.java:288)
	at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:314)
	at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:355)
	at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:808)
	at java.base/java.net.Socket$SocketInputStream.read(Socket.java:966)
	at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:161)
	at org.apache.http.impl.io.SocketInputBuffer.fillBuffer(SocketInputBuffer.java:82)