[BUG] Remove logstash from downloads page

[derek-ho]

Describe the bug

On: https://opensearch.org/downloads.html, the logstash OSS plugin should be removed

Expected behavior

On: https://opensearch.org/downloads.html, the logstash OSS plugin should be removed

Screenshots

No response

To Reproduce

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Additional Details

Plugins Please list all plugins currently enabled.

Screenshots If applicable, add screenshots to help explain your problem.

Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context Add any other context about the problem here.

[dblock]

[Catch All Triage - 1, 2, 3, 4, 5]

[nateynateynate]

I took the liberty of taking care of this a while back.