Remove Insights feature gating (#54584)

Co-authored-by: Rachael Rose Renk <91027132+rachaelrenk@users.noreply.github.com>

content/issues/planning-and-tracking-with-projects/viewing-insights-from-your-project/about-insights-for-projects.md

@@ -8,7 +8,6 @@ versions:
 redirect_from:
   - /issues/trying-out-the-new-projects-experience/using-insights-with-projects
 type: tutorial
-product: '{% data reusables.gated-features.historical-insights-for-projects %}'
 permissions: '{% data reusables.projects.insights-permissions %}'
 topics:
   - Projects

content/issues/planning-and-tracking-with-projects/viewing-insights-from-your-project/configuring-charts.md

@@ -6,7 +6,6 @@ versions:
   ghec: '*'
   ghes: '*'
 type: tutorial
-product: '{% data reusables.gated-features.historical-insights-for-projects %}'
 permissions: '{% data reusables.projects.insights-permissions %}'
 topics:
   - Projects

content/issues/planning-and-tracking-with-projects/viewing-insights-from-your-project/creating-charts.md

@@ -6,7 +6,6 @@ versions:
   ghec: '*'
   ghes: '*'
 type: tutorial
-product: '{% data reusables.gated-features.historical-insights-for-projects %}'
 permissions: '{% data reusables.projects.insights-permissions %}'
 topics:
   - Projects