[JENKINS-48227] Use "Files.createTempDirectory" to create temp directory (#3161)

* Use "Files.createTempDirectory" to create temp directory instead
See SonarQube critical vulnerability squid:S2976 (tag: owasp-a9)
https://next.sonarqube.com/sonarqube/coding_rules#rule_key=squid%3AS2976

* [JENKINS-48227]
Creating a utility "static Path toPath(File file) throws IOException" method,
which wraps InvalidPathException to IOException so that it will be checked.
- also fixed public static final reference
- fixed broken test cases
- added new test cases for toPath() and createTempDir()

* Revert back to public static int

* adjustments due to merges

* Add posix check to determine if Posix FileAttributes should be included
in call to Files.createTempDirectory()

* Remove reference to private element

* Updated to use explicit imports