Update issue template to not use CE and EE

Update issue templates to use new links to the GitLab project
after it has been moved

.gitlab/issue_templates/Bug.md

@@ -2,17 +2,10 @@
 Please read this!
 
 Before opening a new issue, make sure to search for keywords in the issues
-filtered by the "regression" or "bug" label.
+filtered by the "regression" or "bug" label:
 
-For the Community Edition issue tracker:
-
-- https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=regression
-- https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=bug
-
-For the Enterprise Edition issue tracker:
-
-- https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name%5B%5D=regression
-- https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name%5B%5D=bug
+- https://gitlab.com/gitlab-org/gitlab/issues?label_name%5B%5D=regression
+- https://gitlab.com/gitlab-org/gitlab/issues?label_name%5B%5D=bug
 
 and verify the issue you're about to submit isn't a duplicate.
 --->

.gitlab/issue_templates/Feature Flag Roll Out.md

@@ -24,7 +24,7 @@ Remove the `:feature_name` feature flag ...
 
 If applicable, any groups/projects that are happy to have this feature turned on early. Some organizations may wish to test big changes they are interested in with a small subset of users ahead of time for example.
 
-- `gitlab-org/gitlab-ce`/`gitlab-org/gitlab-ee` projects
+- `gitlab-org/gitlab` project
 - `gitlab-org`/`gitlab-com` groups
 - ...
 

.gitlab/issue_templates/Security Release.md

@@ -18,13 +18,7 @@ Set the title to: `Security Release: 12.2.X, 12.1.X, and 12.0.X`
 
 ## Security Issues:
 
-### CE
-
-* {https://gitlab.com/gitlab-org/gitlab-ce/issues link}
-
-### EE
-
-* {https://gitlab.com/gitlab-org/gitlab-ee/issues link}
+* {https://gitlab.com/gitlab-org/gitlab/issues link}
 
 ## Security Issues in dev.gitlab.org:
 

.gitlab/issue_templates/Test plan.md

@@ -2,7 +2,7 @@
 
 <!-- This issue outlines testing activities related to a particular issue or epic.
 
-[Here is an example test plan](https://gitlab.com/gitlab-org/gitlab-ce/issues/50353)
+[Here is an example test plan](https://gitlab.com/gitlab-org/gitlab-foss/issues/50353)
 
 This and other comments should be removed as you write the plan -->
 
@@ -63,7 +63,7 @@ intersection of Components and Attributes.
 Some features might be simple enough that they only involve one Component, while
 more complex features could involve multiple or even all.
 
-Example (from https://gitlab.com/gitlab-org/gitlab-ce/issues/50353):
+Example (from https://gitlab.com/gitlab-org/gitlab-foss/issues/50353):
 * Repository is
   * Intuitive
     * It's easy to select the desired file template