[infra] Adjust the links to search for issues (#302)

Author: michelengelen

.github/ISSUE_TEMPLATE/1.bug.yml

@@ -9,7 +9,7 @@ body:
     attributes:
       label: Search keywords
       description: |
-        Your issue may have already been reported! First search for duplicates among the [existing issues](https://github.com/mui/mui-design-kits/issues).
+        Your issue may have already been reported! First search for duplicates among the [existing issues](https://github.com/mui/mui-design-kits/issues?utf8=%E2%9C%93&q=is%3Aopen+is%3Aclosed).
         If your issue isn't a duplicate, great! Please list the keywords you used so people in the future can find this one more easily:
     validations:
       required: true

.github/ISSUE_TEMPLATE/2.feature.yml

@@ -9,7 +9,7 @@ body:
     attributes:
       label: Search keywords
       description: |
-        Your issue may have already been reported! First search for duplicates among the [existing issues](https://github.com/mui/mui-design-kits/issues).
+        Your issue may have already been reported! First search for duplicates among the [existing issues](https://github.com/mui/mui-design-kits/issues?utf8=%E2%9C%93&q=is%3Aopen+is%3Aclosed).
         If your issue isn't a duplicate, great! Please list the keywords you used so people in the future can find this one more easily:
     validations:
       required: true

.github/ISSUE_TEMPLATE/3.support.yml

@@ -8,12 +8,12 @@ body:
       value: |
         Please provide a searchable summary of the issue in the title above ⬆️.
 
-        ⚠️ **Don't use this form if the problem is [a bug](https://github.com/mui/mui-design-kits/issues/new?assignees=&labels=status%3A+needs+triage&template=1.bug.yml) or a [feature request](https://github.com/mui/mui-design-kits/issues/new?assignees=&labels=status%3A+needs+triage&template=2.feature.yml), use the dedicated form instead.**
+        ⚠️ **Don't use this form if the problem is [a bug](https://github.com/mui/mui-design-kits/issues/new?assignees=&labels=status%3A+waiting+for+maintainer&template=1.bug.yml) or a [feature request](https://github.com/mui/mui-design-kits/issues/new?assignees=&labels=status%3A+waiting+for+maintainer&template=2.feature.yml), use the dedicated form instead.**
   - type: input
     attributes:
       label: Search keywords
       description: |
-        Your issue may have already been reported! First search for duplicates among the [existing issues](https://github.com/mui/mui-design-kits/issues).
+        Your issue may have already been reported! First search for duplicates among the [existing issues](https://github.com/mui/mui-design-kits/issues?utf8=%E2%9C%93&q=is%3Aopen+is%3Aclosed).
         If your issue isn't a duplicate, great! Please list the keywords you used so people in the future can find this one more easily:
     validations:
       required: true