Summary of changes:
- Move Checkstyle-specific build parameters out of
`run-integration-test.sh`.
- Build with `-Dmaven.compiler.failOnError=true` to compensate for
`<failOnError>false</failOnError>` configured by the enabled Maven
profiles.
- Tweak `XdocGenerator.java` logic prior to integration test execution,
to work around a subtle semantic difference introduced by the
`FilesCreateTempFileToFile` Refaster rule.
- Document this difference on the relevant Refaster rules.
- To aid debugging, run Maven commands with `set -x`, such that the
exact command executed is logged.
- Update the patch file containing the expected changes.
Summary of changes:
- Update the set of expected changes for compatibility with the latest
features, except for the `ErrorProneRuntimeClasspath` check.
- Test against version 10.12.7 rather than 10.13.0.
- Omit the targeted tag from file names, so that similar upgrade PRs can be
tested using an `/integration-test` GitHub comment.
