Fix checkstyle coverage check for filenames with whitespaces

[dmikhalin]

What is the goal of this PR?

The checkstyle coverage check failed if there were files in the workspace with whitespaces in filenames. We fix it.

What are the changes implemented in this PR?

The list of files was generated by splitting the find command result by all whitespace characters. But each file is listed in a separate line, that allows us to split by "\n" only.

[typedb-bot]

PR Review Checklist

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Trivial Change

• [x] This change is trivial and does not require a code or architecture review.

Code

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• [ ] Packages, classes, and methods are grouped into cohesive and consistent domain model.
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Architecture

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• [ ] The architecture is extensible and scalable.