fix: pass reference_doctype to search query methods

[ankush]

Isssue: If you create user permissions with "applicable_for" it's supposed to apply those UP to queries when link field is getting queries, however, the reference doctype isn't passed at all to custom queries so there's no way for them to know where it's being linked.

refer:

• frappe/frappe/model/db_query.py

  Lines 174 to 176 in e6279e0

  	# for contextual user permission check
  	# to determine which user permission is applicable on link field of specific doctype
  	self.reference_doctype = reference_doctype or self.doctype

• frappe/frappe/model/db_query.py

  Lines 962 to 969 in e6279e0

  	# append docs based on user permission applicable on reference doctype
  	# this is useful when getting list of docs from a link field
  	# in this case parent doctype of the link
  	# will be the reference doctype
  	elif df.get("fieldname") == "name" and self.reference_doctype:
  	if permission.get("applicable_for") == self.reference_doctype:
  	docs.append(permission.get("doc"))

Fix: pass reference_doctype to queries. frappe.call ensures that it's only passed to functions which can accept it, so nothing to worry about ~ backward compatible change.

dependent PR: frappe/erpnext#35038

ref: ISS-23-24-00271

[codecov]

Codecov Report

Merging #20842 (a41c5bd) into develop (e6279e0) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #20842      +/-   ##
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- Coverage    63.95%   63.95%   -0.01%     
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  Files          759      759              
  Lines        68789    68789              
  Branches      6219     6219              
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- Hits         43997    43993       -4     
- Misses       21275    21279       +4     
  Partials      3517     3517              

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