Only load terraform banner js on project overview

What does this MR do and why?

Don't load terraform banner on every page, as it is only displayed on project overview page. pages/projects/index.js is loaded on every projects/* page, but we only need this on pages/projects/show.

Screenshots or screen recordings

no visual changes

How to set up and validate locally

1. Add a .tf file to a new project and go to project overview page

or, apply this little diff

diff --git a/app/views/projects/_terraform_banner.html.haml b/app/views/projects/_terraform_banner.html.haml
index 881e4ccd9df3..46d351f0f9d2 100644
--- a/app/views/projects/_terraform_banner.html.haml
+++ b/app/views/projects/_terraform_banner.html.haml
@@ -1,5 +1,4 @@
 - @content_class = "container-limited limit-container-width" unless fluid_layout
 
-- if show_terraform_banner?(project)
-  .container-fluid{ class: @content_class }
-    .js-terraform-notification{ data: { terraform_image_path: image_path('illustrations/third-party-logos/ci_cd-template-logos/terraform.svg') } }
+.container-fluid{ class: @content_class }
+  .js-terraform-notification{ data: { terraform_image_path: image_path('illustrations/third-party-logos/ci_cd-template-logos/terraform.svg') } }

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.