Backend fixes - Refinement of Health Checks and standard Returns

[FalkWolsky]

Proposed changes

The standard responses from the API-Service were misleading (404 or even 500 Status Codes, even if everything was ok).

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

Thank you very much @ludomikula!

[netlify]

✅ Deploy Preview for lowcoder-test canceled.

Name	Link
🔨 Latest commit	2ac066d
🔍 Latest deploy log	https://app.netlify.com/sites/lowcoder-test/deploys/6654f7aefd79840007aab45e

[netlify]

✅ Deploy Preview for lowcoder-test canceled.

Name	Link
🔨 Latest commit	438d75a
🔍 Latest deploy log	https://app.netlify.com/sites/lowcoder-test/deploys/6654f7b745ef8000085eb420

[FalkWolsky]

Fantastic. Thank you very much for this important contribution!