Auto merge of #7197 - xFrednet:4310-depreciated-lints-collection, r=flip1995

Metadata collection monster eating deprecated lints

This adds the collection of deprecated lints to the metadata collection monster. The JSON output has the same structure with the *new* lint group "DEPRECATED". Here is one of fourteen examples it was able to dig up in Clippy's code:

```JSON
  {
    "id": "assign_op_pattern",
    "id_span": {
      "path": "src/assign_ops.rs",
      "line": 34
    },
    "group": "clippy::style",
    "docs": " **What it does:** Checks for `a = a op b` or `a = b commutative_op a` patterns.\n\n **Why is this bad?** These can be written as the shorter `a op= b`.\n\n **Known problems:** While forbidden by the spec, `OpAssign` traits may have\n implementations that differ from the regular `Op` impl.\n\n **Example:**\n ```rust\n let mut a = 5;\n let b = 0;\n // ...\n // Bad\n a = a + b;\n\n // Good\n a += b;\n ```\n",
    "applicability": {
      "is_multi_part_suggestion": false,
      "applicability": "MachineApplicable"
    }
  }
```

And you! Yes you! Sir or Madam can get all of this **for free** in Clippy if this PR gets merged. (Sorry for the silliness ^^)

---

See: #7172 for the full metadata collection to-do list or to suggest a new feature in connection to it :upside_down_face:

---

changelog: none

r? `@flip1995`

0 files changed, 0 insertions, 0 deletions