✨ [#3573] Add a new template tag `as_json` #7905

Job	Run time
Check code formatting with black	1m 31s
Code style (flake8)	1m 18s
Lint dependencies	8s
Check import sorting	1m 27s
Check for model changes not present in the migrations or default_admin_index fixture	1m 44s
	6m 8s

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