Remove WireMock usage in repo

[Alan Zimmer (alzimmermsft)]

Description

Removes usage of WireMock as it's been end-of-life for Java 8 in a long time and can be easily replaced by mocking interfaces / removing its usage where it's not really needed.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

Removes WireMock usage from the repo (and related configuration) to keep test infrastructure compatible with Java 8 and simplify test setup by using in-process HTTP mocking.

Changes:

• Removed the WireMock backend option from azure-core-perf stress options and docs.
• Reworked LROPollerTests to use HttpClient + MockHttpResponse instead of a WireMock server.
• Removed wiremock-jre8-standalone dependencies (and related versioning references) from affected modules.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdk/core/azure-core-perf/src/test/java/com/azure/core/perf/CorePerfIntegrationTest.java	Removes WireMock backend test permutations.
sdk/core/azure-core-perf/src/main/java/com/azure/core/perf/core/RestProxyTestBase.java	Deletes WireMock server setup/cleanup logic.
sdk/core/azure-core-perf/src/main/java/com/azure/core/perf/core/CorePerfStressOptions.java	Removes WIREMOCK from backend options and updates docs.
sdk/core/azure-core-perf/README.md	Removes “Running with Wiremock” instructions.
sdk/core/azure-core-perf/pom.xml	Drops WireMock dependency and related enforcer configuration.
sdk/core/azure-core-management/src/test/java/com/azure/core/management/implementation/polling/LROPollerTests.java	Replaces WireMock-based LRO tests with HttpClient-based mocks.
sdk/core/azure-core-management/pom.xml	Replaces WireMock/Netty test deps with azure-core-test (for MockHttpResponse).
sdk/compute/azure-resourcemanager-compute/pom.xml	Removes WireMock test dependency.
eng/versioning/external_dependencies.txt	Removes WireMock from tracked external test dependencies.

Suppressed comments (3)

sdk/core/azure-core-management/src/test/java/com/azure/core/management/implementation/polling/LROPollerTests.java:676

• This assertion only checks that getFinalResult() returns a non-null Mono, which is always true; it doesn't validate that the final result is produced (and non-null).

        StepVerifier.create(lroFlux.last())
            .assertNext(response -> assertNotNull(response.getFinalResult()))
            .verifyComplete();

sdk/core/azure-core-management/src/test/java/com/azure/core/management/implementation/polling/LROPollerTests.java:41

• org.junit.jupiter.api.Assertions is imported but no longer used after switching to static assertion imports; this will fail compilation due to an unused import.

This issue also appears in the following locations of the same file:

• line 589
• line 674

import com.azure.core.util.serializer.SerializerAdapter;
import com.azure.core.util.serializer.SerializerEncoding;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;

sdk/core/azure-core-management/src/test/java/com/azure/core/management/implementation/polling/LROPollerTests.java:593

• The sync-stack timeout test creates a single-thread executor but never shuts it down, and on timeout it doesn't cancel the running poller task. This can leak non-daemon threads and make the test suite flaky/hang.

            ExecutorService executor = Executors.newSingleThreadExecutor();
            try {
                Future<?> future = executor.submit((Runnable) lroPoller::getFinalResult);
                future.get(timeoutDuration.toMillis(), TimeUnit.MILLISECONDS);
            } catch (TimeoutException e) {

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