fix(health): add missing check for media conversion lambda

[tthvo]

Welcome to PrivacyPal! 👋

Fixes: #616

Description of the change:

• Added availability check for media conversion lambda.
• Cleaned up health check utilities.

Motivation for the change:

See #616

How to test

$ http -v http://localhost:8080/health
GET /health HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: localhost:8080
User-Agent: HTTPie/3.2.2



HTTP/1.1 200 OK
Connection: keep-alive
Date: Thu, 29 Feb 2024 17:27:45 GMT
Keep-Alive: timeout=5
Transfer-Encoding: chunked
content-type: application/json
vary: RSC, Next-Router-State-Tree, Next-Router-Prefetch, Next-Url

{
    "data": {
        "app_version": "0.1.0-dev",
        "database_available": true,
        "video_conversion_available": true,
        "video_processor_available": true,
        "video_storage_available": true
    }
}

[connordoman]

Definitely a health check!