Strict config lookup for the REST Client

[radcortez]

Follow up #42932

SmallRye Config now has the ability to add a @WithKeys annotation to a Map mapping. This allows us to provide the list of keys a Map must load. In the case of the REST Client, these keys are known during build time, so we can set them to be loaded during runtime with the following benefits:

• Allows to retrieve configuration from sources that do not list their property names
• Heavily reduce the number of lookups due to how many combinations the REST Client allows

This PR is a breaking change . Currently, to populate a REST Client configuration, we query the following configuration names:

• quarkus.rest-client."[FQN]".*
• quarkus.rest-client.[Simple Class Name].*
• quarkus.rest-client."[Simple Class Name]".*
• quarkus.rest-client.[Config key from @RegisterRestClient].*
• quarkus.rest-client."[Config key from @RegisterRestClient]".*
• [FQN]/mp-rest/*
• [Config key from @RegisterRestClient]/mp-rest/*

Users can mix all of these in their configuration. The final configuration is a merge of all names.

This PR will selectively add which fallbacks are required. For instance, if @RegisterRestClient#configKey is absent, we don't include fallbacks for that style name. We don't include an unquoted fallback if the configKey is multi-segments. This should help reduce the number of lookups, but there are still too many combinations for little value.

We may want to consider removing the [Simple Class Name] and "[Simple Class Name]" lookups. Or merge it with configKey, as if configKey is absent use [Simple Class Name]; if not, use configKey. In the documentation, I couldn't find any references to [Simple Class Name] to configure the REST Client: https://quarkus.io/guides/rest-client#create-the-configuration

Breaking changes:

• Only REST Clients discovered by Quarkus are loaded by the @ConfigMapping
• The REST Clients config Map always uses the FQN of the REST Client. Before, it would use all the keys found, even if related with the same REST Client duplicating (or more) entries.
• Removed legacy configuration names quarkus.rest.client.max-redirects and quarkus.rest.client.multipart-post-encoder-mode

[github-actions]

🎊 PR Preview de27583 has been successfully built and deployed to https://quarkus-pr-main-43345-preview.surge.sh/version/main/guides/

• Images of blog posts older than 3 months are not available.
• Newsletters older than 3 months are not available.

[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit 5c62c82.

✅ 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.

Warning

There are other workflow runs running, you probably need to wait for their status before merging.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 5c62c82.

✅ 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.

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 21

📦 devtools/cli

✖ io.quarkus.cli.plugin.PluginCatalogServiceTest.shouldSyncWhenProjectFileIsNewerThanCatalog - History

• expected: <true> but was: <false> - org.opentest4j.AssertionFailedError

org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
	at org.junit.jupiter.api.AssertTrue.failNotTrue(AssertTrue.java:63)
	at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:36)
	at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:31)
	at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:183)
	at io.quarkus.cli.plugin.PluginCatalogServiceTest.shouldSyncWhenProjectFileIsNewerThanCatalog(PluginCatalogServiceTest.java:109)