Bump @angular/core from 8.2.12 to 10.2.5 in /zeppelin-web-angular #3326

Job	Run time
default-build (8)	19m 38s
core-modules (hadoop2, 8)	1h 2m 19s
default-build (11)	10m 57s
flink-test-and-flink-integration-test (113)	1h 21m 42s
core-modules (hadoop2, 11)	58m 47s
interpreter-test-jupyter-python-rlang (3.7, 8)	26m 48s
flink-test-and-flink-integration-test (114)	1h 27m 45s
core-modules (hadoop3, 8)	36m 54s
interpreter-test-jupyter-python-rlang (3.7, 11)	24m 29s
flink-test-and-flink-integration-test (115)	1h 15m 30s
core-modules (hadoop3, 11)	52m 54s
interpreter-test-jupyter-python-rlang (3.8, 8)	17m 11s
interpreter-test-non-core (8)	32m 47s
flink-test-and-flink-integration-test (116)	1h 6m 7s
interpreter-test-non-core (11)	35m 13s
interpreter-test-jupyter-python-rlang (3.8, 11)	14m 0s
livy-0-7-with-spark-3-4-1-under-python3	28m 29s
spark-integration-test (3, 8)	31m 58s
spark-test (3.7, 8)	1h 24m 45s
spark-integration-test (3, 11)	34m 49s
zeppelin-integration-test (8)	46m 4s
spark-test (3.7, 11)	1h 12m 46s
zeppelin-integration-test (11)	43m 8s
spark-test (3.8, 8)	1h 23m 40s
spark-test (3.8, 11)	1h 7m 58s
	19h 56m 38s

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