fix: preserve zero values in XML export #15671

Job	Run time
Setup PHP Version for Code Coverage	2s
Others (8.3) / Sanity Tests	1m 20s
Others (8.2) / Sanity Tests	2m 43s
Others (8.5) / Sanity Tests	1m 31s
Others (8.4) / Sanity Tests	1m 29s
CacheLive (8.3) / Cache Live Tests	1m 2s
CacheLive (8.2) / Cache Live Tests	1m 14s
CacheLive (8.4) / Cache Live Tests	58s
SeparateProcess (8.5) / tests	2m 6s
SeparateProcess (8.4) / tests	2m 6s
SeparateProcess (8.2) / tests	2m 18s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 9s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 24s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 58s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	4m 52s
SeparateProcess (8.3) / tests	2m 9s
DatabaseLive (8.2, Postgre, 8.0) / tests	2m 18s
DatabaseLive (8.2, SQLite3, 8.0) / tests	1m 52s
CacheLive (8.5) / Cache Live Tests	1m 13s
DatabaseLive (8.5, Postgre, 8.0) / tests	1m 44s
DatabaseLive (8.2, OCI8, 8.0) / tests	8m 26s
DatabaseLive (8.3, Postgre, 8.0) / tests	1m 49s
DatabaseLive (8.4, MySQLi, 8.0) / tests	3m 17s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 59s
DatabaseLive (8.5, OCI8, 8.0) / tests	6m 54s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	4m 50s
DatabaseLive (8.4, SQLite3, 8.0) / tests	1m 8s
DatabaseLive (8.4, OCI8, 8.0) / tests	7m 3s
DatabaseLive (8.3, SQLite3, 8.0) / tests	1m 9s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 57s
DatabaseLive (8.5, MySQLi, 8.0) / tests	8m 11s
DatabaseLive (8.5, SQLite3, 8.0) / tests	1m 6s
DatabaseLive (8.4, Postgre, 8.0) / tests	1m 41s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 1s
Upload coverage results to Coveralls / coveralls	53s
	1h 46m 52s

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