DAOS-15778 test: remove DataMoverTestBase.posix_local_test_paths

[daltonbohning]

remove DataMoverTestBase.posix_local_test_paths in favor of local references

Test-tag: datamover
Skip-unit-tests: true
Skip-fault-injection-test: true

Required-githooks: true

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• Any tests skipped by the ticket being addressed have been run and passed in the PR.

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[github-actions]

Ticket title is 'ftest: update DataMoverTestBase.pre_tear_down() to instead use self.register_cleanup()'
Status is 'In Progress'
https://daosio.atlassian.net/browse/DAOS-15778