Add Support for Trusted Proxy Detection on Forwarded Requests

[cescoffier]

This PR introduces a way to determine if a trusted proxy has forwarded a request behind a proxy. It implements a custom header (X-Forwarded-Trusted-Proxy) that allows request processing to verify the presence of this header, indicating the request originated from a trusted source.

To prevent forgery, any incoming request containing this custom header has it removed before further processing.

CC @shawkins

[quarkus-bot]

Status for workflow Quarkus Documentation CI

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It should be safe to merge provided you have a look at the other checks in the summary.

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[github-actions]

🎊 PR Preview d085393 has been successfully built and deployed to https://quarkus-pr-main-44184-preview.surge.sh/version/main/guides/

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 5069761.

✅ 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 17

📦 extensions/opentelemetry/deployment

✖ io.quarkus.opentelemetry.deployment.metrics.HttpServerMetricsTest.collectsHttpRouteFromEndAttributes - History

• Assertion condition defined as a Lambda expression in io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter expected: <true> but was: <false> within 5 seconds. - org.awaitility.core.ConditionTimeoutException

org.awaitility.core.ConditionTimeoutException: Assertion condition defined as a Lambda expression in io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter expected: <true> but was: <false> within 5 seconds.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.AssertionCondition.await(AssertionCondition.java:119)
	at org.awaitility.core.AssertionCondition.await(AssertionCondition.java:31)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1006)
	at org.awaitility.core.ConditionFactory.untilAsserted(ConditionFactory.java:790)
	at io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter.assertCountPointsAtLeast(InMemoryMetricExporter.java:131)
	at io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter_ClientProxy.assertCountPointsAtLeast(Unknown Source)

• Assertion condition defined as a Lambda expression in io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter expected: <true> but was: <false> within 5 seconds. - org.awaitility.core.ConditionTimeoutException

org.awaitility.core.ConditionTimeoutException: Assertion condition defined as a Lambda expression in io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter expected: <true> but was: <false> within 5 seconds.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.AssertionCondition.await(AssertionCondition.java:119)
	at org.awaitility.core.AssertionCondition.await(AssertionCondition.java:31)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1006)
	at org.awaitility.core.ConditionFactory.untilAsserted(ConditionFactory.java:790)
	at io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter.assertCountPointsAtLeast(InMemoryMetricExporter.java:131)
	at io.quarkus.opentelemetry.deployment.common.exporter.InMemoryMetricExporter_ClientProxy.assertCountPointsAtLeast(Unknown Source)

[cescoffier]

I've added the backport label because it was requested. Now, it's a feature (minimal but still a feature), so I won't fight for it. If it merges clean, that's okay.