F cleanup rules

Summary

After caosdb-server#146 (closed) the rules table and the getRules procedure are obsolete. This MR removes them.

Check List for the Author

• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

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patches/patch20210621-5.0.0/drop_rules_table.sql

+-- Table is no longer needed, jobs rules are now handled by the server alone.
 DROP TABLE IF EXISTS rules;