Update projects item limit from 1,200 to 50,000 (#54848)

Co-authored-by: Sam Browning <106113886+sabrowning1@users.noreply.github.com>

Author: evi-liu

data/variables/projects.yml

@@ -20,7 +20,7 @@ project_v2_and_v1: '{% data variables.projects.project_v2 %}{% ifversion project
 projects_v2_and_v1_if_create: '{% data variables.projects.projects_v2 %}{% ifversion projects-v1-can-create %} and {% data variables.projects.projects_v1_boards %}{% endif %}'
 
 # Limits
-item_limit: '1,200'
+item_limit: '50,000'
 archived_item_limit: '10,000'
 issue_type_limit: '25'
 sub-issue_limit: '100'