✨ [#3573] Add a new template tag `as_json` #7906

Job	Run time
Check code formatting with black	1m 17s
Check import sorting	1m 11s
Check for model changes not present in the migrations or default_admin_index fixture	1m 54s
Code style (flake8)	1m 11s
Lint dependencies	6s
	5m 39s

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