4.x: Remove unused method ConfigMapperManager.mapper #7000

Job	Run time
build	5m 53s
checkstyle	4m 0s
copyright	3m 30s
shellcheck	3m 8s
tests/core	10m 56s
tests/it	14m 29s
tests/dbclient	8m 39s
spotbugs/core	10m 36s
tests/tck-cdi	17m 42s
tests/native-image-mp-1-linux	6m 40s
tests/dbclient-oracle	15m 53s
spotbugs/integrations	7m 12s
tests/tck-rest	14m 31s
tests/native-image-mp-2-linux	11m 55s
spotbugs/others	12m 43s
tests/others	12m 14s
tests/tck-others	17m 4s
tests/native-image-mp-3-linux	6m 32s
tests/native-image-se-1-linux	6m 57s
tests/native-image-inject-linux	6m 24s
archetypes/r1-jar	6m 42s
docs	4m 43s
tests/native-image-mp-1-macos	8m 37s
examples/linux	12m 46s
archetypes/r2-jar	6m 45s
tests/native-image-mp-2-macos	23m 23s
examples/macos	9m 17s
archetypes/r3-jar	5m 53s
tests/native-image-mp-3-macos	7m 42s
javadoc (core)	6m 53s
archetypes/r4-jar	6m 48s
tests/native-image-se-1-macos	7m 49s
javadoc (integrations)	5m 32s
archetypes/r5-jar	5m 8s
tests/native-image-inject-macos	6m 1s
javadoc (others)	7m 43s
archetypes/legacy	4m 36s
tests/packaging-jar-linux	8m 5s
quickstarts/linux	11m 51s
tests/packaging-jlink-linux	8m 50s
quickstarts/macos	11m 42s
tests/packaging-jar-macos	5m 0s
tests/packaging-jlink-macos	6m 44s
tests/results	12s
gate	1s
	6h 25m 41s

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