BUG FIX: Fix trailing AND in edge_search_filter_query_constructor Cypher query

[TheEpTic]

When using the filters, I found a bug that would create a neo4j error. The Neo.ClientError.Statement.SyntaxError occurs because the Cypher query generated by the edge_search_filter_query_constructor function in graphiti_core.search.search_filters is syntactically invalid.

Specifically:

- ERROR - Error using Graphiti client in searchCrypto: {code: Neo.ClientError.Statement.SyntaxError} {message: Invalid input ')': expected an expression (line 6, column 38 (offset: 292))
"AND ((r.valid_at >= $valid_at_0) AND ) AND ((r.invalid_at > $invalid_at_0) AND )AND ((r.expired_at > $expired_at_0) AND )"
                                      ^}

From this:

from graphiti_core.search.search_filters import ComparisonOperator, DateFilter, SearchFilters, edge_search_filter_query_constructor
from datetime import datetime, timedelta, timezone

current_date = datetime.now(timezone.utc)
one_month_ago = current_date - timedelta(days=30)

filters = SearchFilters(
	valid_at=[
		[DateFilter(date=one_month_ago, comparison_operator=ComparisonOperator.greater_than_equal)]
	],
	invalid_at=[
		[DateFilter(date=current_date, comparison_operator=ComparisonOperator.greater_than)]
	],
	expired_at=[
		[DateFilter(date=current_date, comparison_operator=ComparisonOperator.greater_than)]
	]
)

# Perform the search with the user-provided query
user_facts = await graphiti_client.search(
	query=query,
	num_results=int(amount),
	group_ids=[f"{config.group_namespace}"],
	search_filter=filters
)

Fix: Corrected the edge_search_filter_query_constructor function to prevent trailing AND operators in generated Cypher queries, which caused Neo.ClientError.Statement.SyntaxError. Changed condition from j != len(and_filter_query) - 1 to j != len(and_filters) - 1 for valid_at, invalid_at, created_at, and expired_at filter blocks. Also fixed outer loop condition to use len(filters.<field>) instead of len(or_list). Ensures valid Cypher syntax for single DateFilter cases..

Testing: I have tested it with the code above, and seems to be in working order. I am yet to test multiple datefilters at the moment but will once I find the time.

This is my first proper PR in forever and I'm new to Python coming from Java :^) so I'm sorry if I messed up anything!

[danielchalef]

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[TheEpTic]

I have read the CLA Document and I hereby sign the CLA