MLE-12345 Reworking how test plumbing clears a database

[rjrudin]

The "clear" that happens via DELETE v1/search causes intermittent failures on Jenkins.

[Copilot]

Pull Request Overview

This PR refactors the database clearing mechanism in test infrastructure to address intermittent failures on Jenkins. The change replaces the REST API-based deletion approach with an XQuery-based solution to improve reliability.

• Replaces DELETE v1/search REST API call with XQuery evaluation for database clearing
• Adds logging to track the number of URIs deleted during the clear operation
• Introduces slf4j import for logging functionality

[Copilot]

The XQuery loads all URIs into memory before deletion, which could cause memory issues with large databases. Consider using a batch processing approach or streaming deletion pattern instead of collecting all URIs at once.

Suggested change

	String count = client.newServerEval()
	.xquery("let $uris := for $uri in cts:uris((), (), cts:true-query()) let $_ := xdmp:document-delete($uri) return $uri " +
	"return fn:count($uris)")
	.evalAs(String.class);
	LoggerFactory.getLogger(ConnectedRESTQA.class).info("Cleared database, deleting {} URIs", count);
	int totalDeleted = 0;
	while (true) {
	String batchCount = client.newServerEval()
	.xquery("let $batch := subsequence(cts:uris((), (), cts:true-query()), 1, 100) " +
	"let $_ := for $uri in $batch return xdmp:document-delete($uri) " +
	"return fn:count($batch)")
	.evalAs(String.class);
	int deleted = Integer.parseInt(batchCount);
	totalDeleted += deleted;
	LoggerFactory.getLogger(ConnectedRESTQA.class).info("Deleted {} URIs in this batch", deleted);
	if (deleted < 100) {
	break; // Exit loop if fewer than 100 URIs were deleted, indicating no more URIs.
	}
	}
	LoggerFactory.getLogger(ConnectedRESTQA.class).info("Cleared database, total URIs deleted: {}", totalDeleted);

[Copilot]

[nitpick] The XQuery string is complex and embedded inline, making it difficult to read and maintain. Consider extracting this to a separate XQuery file or a well-formatted multi-line string with proper indentation.

Suggested change

	.xquery("let $uris := for $uri in cts:uris((), (), cts:true-query()) let $_ := xdmp:document-delete($uri) return $uri " +
	"return fn:count($uris)")
	.xquery(
	"let $uris := " +
	" for $uri in cts:uris((), (), cts:true-query()) " +
	" let $_ := xdmp:document-delete($uri) " +
	" return $uri " +
	"return fn:count($uris)"
	)