docs: request sample files in issue templates (#6770)

## Summary
- add sample/example file prompts to the bug report and feature request
issue forms
- remind reporters to remove sensitive information before attaching
files

Closes #4480

## Checks
- `git diff --check`
- parsed both updated issue template YAML files with PyYAML and verified
the `sample-files` field is present

Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>

.github/ISSUE_TEMPLATE/1-bug.yml

@@ -98,6 +98,13 @@ body:
       description: |
         If you have any additional information that might help us understand and resolve the issue, provide it here.
 
+  - type: textarea
+    id: sample-files
+    attributes:
+      label: Sample Files
+      description: |
+        If possible, attach the PDF or other input files needed to reproduce the issue. Remove any sensitive information before sharing.
+
   - type: markdown
     attributes:
       value: |

.github/ISSUE_TEMPLATE/2-feature.yml

@@ -67,6 +67,13 @@ body:
       description: |
         If you have any additional information, comments, or resources you think would support or be relevant to your feature request, include them here.
 
+  - type: textarea
+    id: sample-files
+    attributes:
+      label: Example Files
+      description: |
+        If the feature request depends on specific PDFs or other example files, attach them here when available. Remove any sensitive information before sharing.
+
   - type: checkboxes
     id: search-confirmation
     attributes: