RBAC: LDAP: Support group search filter filter and subtree search

[Haarolean]

• Breaking change? (if so, please describe the impact and migration path for existing application instances)

What changes did you make? (Give an overview)
Closes #3883

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• No need to
• Manually (please, describe, if necessary)
• Unit checks
• Integration checks
• Covered by existing automation

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• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. ENVIRONMENT VARIABLES)
• My changes generate no new warnings (e.g. Sonar is happy)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

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[0x4ec7]

This parameter is pretty much needed, and a more generic default value should be used, eg, (|(member={0})(uniqueMember={0})).

[Haarolean]

Superseded by #3979