feat: min_delta & other updates

[sakulstra]

I wanted to use the action but had a few issues.

In our ptoject we got a lot of entry points, and reporting them all, regularly resulted in comment length exceeds 65536 characters.
Therefore I applied the following changes:

• min_delta property on the action. If specified in % the action will not report size changes < the delta. This way we filter out all unchanged and irrelevant changes.
• comments are now truncated if they exceed 65536 characters
• i had problems installing dependencies on modern node. Therefore I upgraded everything and removed eslint (partially because i was to lazy to migrate, but also because i think in a small project like this the upside is quite minimal)

Lmk if any/ or all of the changes sound legit to you then i will try to isolate in dedicated prs if desired.