Fix join message in websocket quickstart

[mocenas]

There should be a "joined" message on user joining, but no message is acctually sent.

No "ready" message is generated on user joining,
so move this message to user incoming.

Relates to quarkusio/quarkus#35061

Check list:

Your pull request:

• targets the development branch
• uses the 999-SNAPSHOT version of Quarkus
• has tests (mvn clean test)
• works in native (mvn clean package -Pnative)
• has integration/native tests (mvn clean verify -Pnative)
• makes sure the associated guide must not be updated
• links the guide update pull request (if needed)
• updates or creates the README.md file (with build and run instructions)
• for new quickstart, is located in the directory component-quickstart
• for new quickstart, is added to the root pom.xml and README.md

[gsmet]

@mocenas actually, it looks like your assumptions were incorrect? Could you get to the bottom of it?

[gsmet]

I think this is related to the test here: https://github.com/quarkusio/quarkus-quickstarts/blob/main/websockets-quickstart/src/test/java/org/acme/websockets/ChatTest.java#L45

[gsmet]

I see we have another fix proposal here: https://github.com/quarkusio/quarkus-quickstarts/pull/1305/files

[mocenas]

@gsmet Code changes were probably OK, only that tests relied on the old behaviour (it actually seems that entire "ready" message was there just for test purposes).
I changed the tests to work with new behaviour.

[mocenas]

Comparing this PR to #1305 this one is more complex, but gets rid of the "ready" message entirely. Which also means that the ready message will not pop up in the chat.

[quarkus-bot]

✔️ 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.