fix(#3257): update jcabi-xml and fix tests

[maxonfjvipon]

Ref: #3257

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PR-Codex overview

This PR updates the version of jcabi-xml in pom.xml, adds new imports in ParseMojoTest.java, and modifies several test methods to improve error detection and handling. It also removes unused methods related to message parsing and regex creation.

Detailed summary

• Updated jcabi-xml version from 0.29.0 to 0.29.1.
• Added imports for Files, Path, and FileTime in ParseMojoTest.java.
• Enhanced error detection in doesNotFailWithNoErrorsAndWarnings, detectsErrorsSuccessfully, detectsCriticalErrorsSuccessfully, and detectsWarningWithCorrespondingFlag methods.
• Removed unused methods getMessage and createRegEx from ParseMojoTest.java.

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[maxonfjvipon]

@yegor256 please check

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