Add data-ga4-form-no-answer-undefined to search form #1028

Job	Run time
Lint SCSS / Run Stylelint	19s
Lint JavaScript / Run Standardx	22s
Lint Ruby / Run RuboCop	13s
Security Analysis / Run Brakeman	18s
Test JavaScript / Run Jasmine	1m 3s
Test Ruby / Run Minitest	5m 45s
	8m 0s

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