Add subscript to issue templates (#7116)

Adds a subscript to issue templates to provide guidance for end-users
and others to interact with issues in a measurable way. This follows
recommendations outlined in the [maintainer guide for managing popular
issues](https://github.com/open-telemetry/community/blob/main/guides/maintainer/popular-issues.md).

cc @danielgblanco

Co-authored-by: otelbot <[email protected]>
Co-authored-by: Tyler Yahn <[email protected]>

Author: 3 people

.github/ISSUE_TEMPLATE/bug_report.md

@@ -27,3 +27,5 @@ A clear and concise description of what the bug is.
 ### Expected behavior
 
 A clear and concise description of what you expected to happen.
+
+<sub>**Tip**: [React](https://github.blog/news-insights/product-news/add-reactions-to-pull-requests-issues-and-comments/) with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding `+1` or `me too`, to help us triage it. Learn more [here](https://opentelemetry.io/community/end-user/issue-participation/).</sub>

.github/ISSUE_TEMPLATE/feature_request.md

@@ -27,3 +27,5 @@ A clear and concise list of any similar and existing solutions from other projec
 ### Additional Context
 
 Add any other context or screenshots about the feature request here.
+
+<sub>**Tip**: [React](https://github.blog/news-insights/product-news/add-reactions-to-pull-requests-issues-and-comments/) with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding `+1` or `me too`, to help us triage it. Learn more [here](https://opentelemetry.io/community/end-user/issue-participation/).</sub>

.github/ISSUE_TEMPLATE/version_release.md

@@ -20,3 +20,5 @@ assignees: ''
 - [ ] [Release contrib](https://github.com/open-telemetry/opentelemetry-go-contrib/blob/main/RELEASING.md#release-process)
 - [ ] [Sync website docs](https://github.com/open-telemetry/opentelemetry-go/blob/main/RELEASING.md#website-documentation)
 - [ ] [Close the milestone](https://github.com/open-telemetry/opentelemetry-go/blob/main/RELEASING.md#close-the-milestone)
+
+<sub>**Tip**: [React](https://github.blog/news-insights/product-news/add-reactions-to-pull-requests-issues-and-comments/) with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding `+1` or `me too`, to help us triage it. Learn more [here](https://opentelemetry.io/community/end-user/issue-participation/).</sub>