ycb_django_pr16877

what a new run launched now would send

New template filter `escapeseq`
Description
	
Following #34574, and after some conversations within the security team, it seems appropriate to provide a new template filter escapeseq which would be to escape what safeseq is to safe. An example of usage would be:
{{ some_list|escapeseq|join:"," }}
where each item of some_list is escaped before applying the join operation. This usage makes sense in a context where autoescape is off.

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