Add coverage index as XML format.

Author: github-actions[bot]

test_coverage.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" ?>
-<coverage version="7.6.4" timestamp="1730299263929" lines-valid="6909" lines-covered="6516" line-rate="0.9431" branches-covered="0" branches-valid="0" branch-rate="0" complexity="0">
+<coverage version="7.6.4" timestamp="1730300092195" lines-valid="6909" lines-covered="6516" line-rate="0.9431" branches-covered="0" branches-valid="0" branch-rate="0" complexity="0">
 	<!-- Generated by coverage.py: https://coverage.readthedocs.io/en/7.6.4 -->
 	<!-- Based on https://raw.githubusercontent.com/cobertura/web/master/htdocs/xml/coverage-04.dtd -->
 	<sources>