Ensure blog posts "with contributions from" secondary authors list are consistently formatted

[chalin]

• Fixes Fix styling of blog "with contributions" #2459
• Updates the blog archetype to reflect new conventions
• End-user blog posts:
  • Renames some "end-user" blog-post files so that we have consistent naming.
  • Ensures that all have the same "with contributions from" first paragraph.
• Copyedits

Preview:

• https://deploy-preview-2460--opentelemetry.netlify.app/blog/2023/end-user-discussions-02/
• https://deploy-preview-2460--opentelemetry.netlify.app/blog/2023/end-user-discussions-01/
• https://deploy-preview-2460--opentelemetry.netlify.app/blog/2023/end-user-q-and-a-series-otel-and-graphql/

Redirect tests:

• https://deploy-preview-2460--opentelemetry.netlify.app/blog/2023/otel-end-user-q-and-a-series-otel-and-graphql/
• https://deploy-preview-2460--opentelemetry.netlify.app/blog/2023/otel-end-user-discussions-january-2023/

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Screenshots

Before (taken from #2459):

After: