Add test for %env directive

[tkilias]

Background

• We should test if the %env directive works for our UDFs, we already have some tests, but they don't cover all important environment variables See more here: https://docs.exasol.com/database_concepts/udf_scripts/programming_languages_detail.htm
• For example, LD_LIBRARY_PATH is not tests, to be precise the test is disabled
  • As more research showed, this test is disabled, because the docker-db has currently a bug
• However, we should also check other environment variables, such as
  • TZ (timezone)
  • LC_* (locale)
  • PATH

Acceptance Criteria

• Add tests for TZ, LC_* and PATH (the correct settings are unclear, so first return them and then lets discuss them)

[tkilias]

LD_LIBRARY_PATH is disabled https://github.com/exasol/script-languages/blob/dd54f66fdaaa4f10dcb85cd2ab65bbf74aafd07d/tests/test/disabled/ldlibrarypath.py

[tkilias]

Blocked by docker-db 7.*