Tests: Switch tests using ldap adparameters ported to ldifde

[jakub-vavra-cz]

Some tests were using ldap/ldif commands from client without tls/ssl which is disabled on AD 2025. Run the commands using ldifde.exe on AD directly instead.

[gemini-code-assist]

Code Review

This pull request refactors Active Directory (AD) parameter tests to use ldifde.exe on the AD host instead of running ldapmodify/ldapadd/ldapdelete on the client. It also introduces base64 encoding for SSH public keys, adds a retry loop when searching for AD users to handle replication delays, and marks a test as flaky. The review feedback highlights that using a static filename like mod.ldif on the AD host can cause race conditions or conflicts, and recommends using unique filenames. Additionally, the reviewer advises against using raiseonerr=False without checking the return code, as this silently ignores setup and modification failures, and suggests letting these commands raise errors on failure instead.

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