F mixed write transactions

Summary

Mixed-write transactions: caosdb/customers/lfpb/management#425

Server MR: caosdb-server!35 (merged)

Focus

This MR just removes the code which prevented the execution of mixed write transactions.

Test Environment

caosdb-cppinttest!17 (merged)

Check List for the Author

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• 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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