HPCC-32711 Define LDAP security manager abstraction

[timothyklemm]

Replace platform references to CLdapSecManager with references to the ILdapSecManager abstraction.

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-32711

Jirabot Action Result:
Workflow Transition To: Merge Pending
Updated PR

[kenrowland]

Unfortunate that it has to be done this way. But looks reasonable to convert to an interface.

[timothyklemm]

@ghalliday please merge.