Handle new format of used_classes_* reports in GraalVM for JDK 24

[zakkak]

Starting with GraalVM for JDK 24 the format of the report has changed
prefixing each line with the class loader name and a colon, e.g.:

GraalVM for JDK 22 (and 23 which is not released yet):

org.postgresql.jdbc.PgSQLXML

GraalVM for JDK 24:

com.oracle.svm.hosted.NativeImageClassLoader:org.postgresql.jdbc.PgSQLXML

See oracle/graal@1d769c7#diff-01f83a129b979abfb9acd79deb25f1db51df940f9d4ca968c301cd9718bf627bR347

Closes #41917

[quarkus-bot]

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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.

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 17 Windows

📦 integration-tests/spring-web

✖ io.quarkus.it.spring.web.openapi.OpenApiWithConfigPMT.testOpenAPI - 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)

[gsmet]

Ah nice to have it handled before we switch to it!

I added a small question.

[gsmet]

Given the comment, I would rather use indexOf() and substring()? Or you are absolutely sure there won't be any other colon?

[zakkak]

For the time being it's at most one colon, something like [<classloader>:]<classname>, that's why I went for the simplest approach. If more colons show up in the future it will still work as long as the classname still appears last in the sequence (and the classname can't contain a colon). If something gets added after the classname then the test will break and we will notice.

I don't think it's worth "validating" the file's format, at least not for the time being.

[gsmet]

Let's merge then, thanks for the confirmation!