Fixed test name solver bug for multi-module projects

[imonteroperez]

• When running PCT for single Maven project Jenkins plugins, surefire-reports used to be on <base-directory-folder>/target but if you run it for multimodule Maven projects it probably will not be able to locate properly where are the surefire-reports.
• Before this PR when we do something like:

java -jar plugins-compat-tester-cli/target/plugins-compat-tester-cli.jar \
[...] 
-includePlugins configuration-as-code 
-mavenProperties test=SecretSourceResolverTest \

We get the following result:

[INFO] -------------------------------------------------------
[INFO] Solving test names
[INFO] -------------------------------------------------------
[WARNING] Unable to retrieve info from: /tmp/pct/work/configuration-as-code/target/surefire-reports
org.jenkins.tools.test.exception.PomExecutionException: [/usr/bin/mvn, --show-version, --batch-mode, -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn, --define=failIfNoTests=false, --define=forkCount=1, hpi:resolve-test-dependencies, hpi:test-hpl, surefire:test, -Djenkins.version=2.222.1-cb-7, -Denforcer.skip=true] failed in /tmp/pct/work/configuration-as-code
	at org.jenkins.tools.test.maven.ExternalMavenRunner.run(ExternalMavenRunner.java:103)
	at org.jenkins.tools.test.PluginCompatTester.testPluginAgainst(PluginCompatTester.java:554)
	at org.jenkins.tools.test.PluginCompatTester.testPlugins(PluginCompatTester.java:314)
	at org.jenkins.tools.test.PluginCompatTesterCli.main(PluginCompatTesterCli.java:175)

Because configuration-as-code is a multi-module Maven project: https://github.com/jenkinsci/configuration-as-code-plugin/blob/master/pom.xml#L15..L19

• After this PR we will obtain the following result:

[INFO] -------------------------------------------------------
[INFO] Solving test names
[INFO] -------------------------------------------------------
[INFO] Reading /tmp/pct/work/configuration-as-code/plugin/target/surefire-reports
[INFO] Extracted 25 testnames from /tmp/pct/work/configuration-as-code/plugin/target/surefire-reports/TEST-io.jenkins.plugins.casc.SecretSourceResolverTest.xml
[INFO] 
[INFO] Results:
[INFO] 
[INFO] Executed: 25
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_defaultValueLimit
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_emptyDefault
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_emptyDefaultEnvDefined
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_mixedMultipleEntries
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_mixedMultipleEntriesEscaped
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_mixedMultipleEntriesWithDefault
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_mixedSingleEntry
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_mixedSingleEntryEscaped
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_mixedSingleEntryWithDefault
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_multipleEntries
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_multipleEntriesEscaped
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_multipleEntriesWithDefaultValue
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_multipleEntriesWithDefaultValueAndEnvDefined
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_multipleEntriesWithoutDefaultValue
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_nothing
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_nothingBrackets
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_nothingDefault
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_nothingSpace
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_singleEntry
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_singleEntryDoubleEscaped
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_singleEntryEscaped
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_singleEntryWithDefaultValue
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_singleEntryWithDefaultValueAndWithEnvDefined
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.resolve_singleEntryWithoutDefaultValue
[INFO] - io.jenkins.plugins.casc.SecretSourceResolverTest.shouldEncodeInternalVarsProperly
[INFO] 
[INFO] Failed: 0

[raul-arabaolaza]

PR errors are not related, merging