feat: added test for length of logs in operation table

[SteBaum]

Which issue(s) this PR fixes

Fixes None

Additional comments

Goes with fix: set byte length for operation.logs column #589 as a test which checks if the logs column in the table operation can handle a large amount of bytes on each databases. The amount of characters has been set to 10 000 000. Before the PR #589 the test failed on MySQL and MariaDB and with the PR it succeeds on these databases.

Agreements

• [x] I hereby declare this contribution to be licensed under the Apache License Version 2.0, January 2004.
• [x] I hereby agree to grant TOSIT a copyright license to use my contributions.

[SteBaum]

Just added the command for the extra test in the documentation with the last force push