Add, then remove, default `bulk` value for `RepublishingEvent`s #8390

Job	Run time
CodeQL SAST scan / Analyze	2m 3s
Dependency Review scan / dependency-review-pr	7s
Lint ERB / Run ERB lint	36s
Dependency Review scan / dependency-review-push	0s
Lint JavaScript / Run Standardx	15s
Prettier / Run Prettier	17s
Lint Ruby / Run RuboCop	31s
Lint SCSS / Run Stylelint	14s
Security Analysis / Run Brakeman	32s
Test features / feature-test-matrix (cucumber:ok)	5m 51s
Test JavaScript / Run Jasmine	32s
Test Ruby / minitest-matrix (4, 0)	3m 8s
Test Ruby / minitest-matrix (4, 1)	2m 31s
Test Ruby / minitest-matrix (4, 2)	3m 40s
Test Ruby / minitest-matrix (4, 3)	2m 25s
Test Ruby / Run Minitest	1s
Test features / Run Cucumber	1s
	22m 44s

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