fix: preserve zero values in XML export #15685

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.5) / Sanity Tests	1m 19s
Others (8.4) / Sanity Tests	1m 17s
Others (8.2) / Sanity Tests	2m 34s
Others (8.3) / Sanity Tests	1m 24s
CacheLive (8.4) / Cache Live Tests	1m 9s
CacheLive (8.2) / Cache Live Tests	1m 23s
CacheLive (8.5) / Cache Live Tests	1m 2s
SeparateProcess (8.2) / tests	2m 50s
SeparateProcess (8.5) / tests	2m 0s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 49s
SeparateProcess (8.3) / tests	2m 10s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	4m 54s
DatabaseLive (8.2, Postgre, 8.0) / tests	2m 46s
SeparateProcess (8.4) / tests	2m 6s
CacheLive (8.3) / Cache Live Tests	1m 5s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 52s
DatabaseLive (8.2, SQLite3, 8.0) / tests	1m 58s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 3s
DatabaseLive (8.5, MySQLi, 8.0) / tests	3m 31s
DatabaseLive (8.3, SQLite3, 8.0) / tests	1m 12s
DatabaseLive (8.5, SQLite3, 8.0) / tests	1m 9s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	4m 31s
DatabaseLive (8.4, SQLite3, 8.0) / tests	1m 15s
DatabaseLive (8.5, Postgre, 8.0) / tests	1m 50s
DatabaseLive (8.4, OCI8, 8.0) / tests	7m 16s
DatabaseLive (8.4, Postgre, 8.0) / tests	1m 47s
DatabaseLive (8.3, Postgre, 8.0) / tests	1m 57s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 4s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 15s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 29s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 45s
DatabaseLive (8.5, OCI8, 8.0) / tests	6m 41s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 10s
Upload coverage results to Coveralls / coveralls	37s
	1h 44m 13s

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