MDCMigration: set padding in regex modal #10928

Job	Run time
build-data-server-pip (native, ubuntu-22.04, 1.65.0)	2m 42s
lint-python-flake8 (3.9)	48s
build-data-server-pip (native, macos-12, 1.65.0)	2m 27s
lint-misc	46s
lint-python-flake8 (3.10)	59s
lint-frontend	2m 38s
build-data-server-pip (universal, ubuntu-22.04, 1.65.0)	30s
lint-python-flake8 (3.11)	27s
lint-python-yaml-docs	47s
lint-rust (1.65.0, 0.16.1)	1m 5s
build (tf, 3.9)	50m 57s
build (notf, 3.9)	49m 14s
	1h 53m 20s

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