project_openldap: make function names more generic

[simonLeary42]

Many of the functions in project_openldap.utils are generic for any LDAP entry, with unnecessarily specific names. I want to import these functions and use them for allocation_ldap.

All these renames were done with vscode/pylance rename symbol feature, which promises to fix all references to a symbol across the entire codebase.

other changes:

• update_project_posixgroup_in_openldap -> update_project_posixgroup_description_in_openldap is actually less generic
• removed variable ldapsearch_project_memberuids_entries which is defined and not used

[simonLeary42]

From @ds-04 (author of project_openldap) on Slack:

this is much needed, and i thought about it doing it .. but it got to the point where i just needed the code in core

only comment is perhaps .. do we use posixGroup in the name .. or posixgroup

e.g. OpenLDAP terms in the functions names .. and their caseing

I dont care much about the capitalization, feel free to suggest edits on my PR and I will apply them

yeah im not that bothered either

its fine i think

ive not tested it .. but it looked fine

[ds-04]

agree with transcript above