[openstreetmap/openstreetmap-website] Give notes a spam score (Issue #6515)

[Pablo Brasero]

pablobm created an issue (openstreetmap/openstreetmap-website#6515)

### Problem

Map notes are a common form of abuse. Some heuristics could be applied to "score" a note and bring it to the attention of moderators.

### Description

Create a "spam score" that applies to notes, similar to the one used for users (see [`app/models/user.rb`](https://github.com/openstreetmap/openstreetmap-website/blob/b715c12a0aae54631addfff1b93600e0337df3d3/app/models/user.rb#L383)).

Some known telltales are:
- Recent or anonymous account
- The note starts with the username
- Random numbers, references, or simple keymashes
- Very short text
- Repeated identical notes
- A large influx of notes in a small area

### Screenshots

_No response_

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