[Improvement-16802][UI] use relative width for task editor #18601

Job	Run time
Backend-Path-Filter	7s
Backend-Build (8)	13m 58s
Backend-Build (11)	13m 6s
cluster-test-mysql-with-zookeeper-registry	4m 1s
cluster-test-mysql-with-mysql-registry	2m 57s
schema-check-with-mysql-3.1.9	1m 11s
schema-check-with-postgresql-3.1.9	1m 43s
cluster-test-postgresql-zookeeper-registry	2m 51s
cluster-test-postgresql-with-postgresql-registry	2m 55s
schema-check-with-mysql-3.2.0	1m 33s
schema-check-with-postgresql-3.2.0	1m 11s
Build	1s
	45m 34s

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