Added a helpful subscript to both GitHub issue templates to improve community engagement and issue prioritization.

Changes Made

• Added a dropdown element with tip subscript to bug_report.yaml
• Added a dropdown element with tip subscript to feature_request.yaml

Subscript Content

The subscript includes:

• Link to GitHub's reaction feature encouraging 👍 reactions to help prioritize issues
• Guidance to provide useful context instead of "+1" or "me too" comments
• Reference to OpenTelemetry community issue participation guidelines

Format

The subscript is implemented as a dropdown element at the bottom of each YAML-based issue form:

- type: dropdown
  attributes:
    label: Tip
    description: This element is static, used to render a helpful sub-heading for end-users and community members to help prioritize issues. Please leave as is.
    options:
      - <sub>[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>
    default: 0

This will help the community understand how to effectively participate in issue triage and prioritization.

Fixes #30.

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