Update GFI template and docs with information about linking PRs to issues (openvinotoolkit#23409)

### Details:
- PRs addressing GFIs are getting difficult to track, this PR aims to
increase the community's awareness about this GitHub feature.
- The change to GFI template will also be introduced to GFI templates in
`openvino_contrib`, `openvino.genai` and `nncf`.
 - An additional reminder has been added to the GFI board:

![image](https://github.com/openvinotoolkit/openvino/assets/55858107/571dc53c-acd4-4181-909b-87fc995a95f1)


### Tickets:
 - N/A

Author: p-wysocki

.github/ISSUE_TEMPLATE/good_first_issue.yml

@@ -43,6 +43,7 @@ body:
       value: |
           - [Contribution guide - start here!](https://github.com/openvinotoolkit/openvino/blob/master/CONTRIBUTING.md)
           - [Intel DevHub Discord channel](https://discord.gg/7pVRxUwdWG) - engage in discussions, ask questions and talk to OpenVINO developers
+          - [How to link your Pull Request to an issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#manually-linking-a-pull-request-to-an-issue-using-the-pull-request-sidebar)
     validations:
       required: true
 

CONTRIBUTING.md

@@ -143,7 +143,7 @@ Use the issue description and locally built OpenVINO to complete the task. Remem
 
 ### 4. Submit a PR with your changes
 
-Follow our [Good Pull Request guidelines](https://github.com/openvinotoolkit/openvino/blob/master/CONTRIBUTING_PR.md).
+Follow our [Good Pull Request guidelines](https://github.com/openvinotoolkit/openvino/blob/master/CONTRIBUTING_PR.md). Please remember about [linking your Pull Request to the issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#manually-linking-a-pull-request-to-an-issue-using-the-pull-request-sidebar) it addresses.
 
 ### 5. Wait for a review
 

CONTRIBUTING_PR.md

@@ -16,6 +16,7 @@
 * Follow the [OpenVINO code style guide](https://github.com/openvinotoolkit/openvino/blob/master/docs/dev/coding_style.md).
 * Make your PRs small - each PR should address one issue. Remove all changes 
   unrelated to the PR.
+* [Link your Pull Request to an issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#manually-linking-a-pull-request-to-an-issue-using-the-pull-request-sidebar) if it addresses one.
 * Document your contribution! If your changes may impact how the user works with
   OpenVINO, provide the information in proper articles. You can do it yourself, 
   or contact one of OpenVINO documentation contributors to work together on