Allow EXPLAIN in read-only mode #803

Job	Run time
matrixbuilder	4s
PG14.15 Debug ubuntu-22.04	10m 46s
PG15.10 Debug ubuntu-22.04	10m 55s
PG16.6 Debug ubuntu-22.04	11m 49s
PG17.2 Debug ubuntu-22.04	10m 36s
PG17.2 Release macos-13	7m 18s
PG17.2 ReleaseWithoutTelemetry ubuntu-22.04	11m 56s
PG14.0 Debug ubuntu-22.04	8m 15s
PG15.0 Debug ubuntu-22.04	14m 18s
PG16.0 Debug ubuntu-22.04	11m 7s
PG17.0 Debug ubuntu-22.04	11m 2s
PG15.10 Debug macos-13	16m 17s
PG16.6 Debug macos-13	20m 14s
PG17.2 Debug macos-13	11m 27s
PG14.15 Release ubuntu-22.04	4m 50s
PG15.10 Release ubuntu-22.04	4m 31s
PG16.6 Release ubuntu-22.04	4m 41s
PG17.2 Release ubuntu-22.04	4m 42s
PG14.15 ApacheOnly ubuntu-22.04	4m 32s
PG15.10 ApacheOnly ubuntu-22.04	2m 23s
PG16.6 ApacheOnly ubuntu-22.04	2m 43s
PG17.2 ApacheOnly ubuntu-22.04	2m 28s
PG14snapshot Debug ubuntu-22.04	13m 22s
PG15snapshot Debug ubuntu-22.04	13m 54s
PG16snapshot Debug ubuntu-22.04	13m 15s
PG17snapshot Debug ubuntu-22.04	14m 6s
	4h 1m 31s

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