Rollup merge of #101809 - aDotInTheVoid:jsondoclint, r=GuillaumeGomez

Replace `check_missing_items.py` with `jsondoclint`

[zulip discussion](https://rust-lang.zulipchat.com/#narrow/stream/266220-rustdoc/topic/check_missing_items.2Epy.20Replacement.2E)

check_missing_items.py was a python script that checked rustdoc json output to make sure all the Id's referenced existed in the JSON index. This PR replaces that with a rust binary (`jsondoclint`) that does the same thing.

### Motivation

1. Easier to change when `rustdoc-json-types` changes, as `jsondoclint` uses the types directly.
2. Better Errors:
    - Multiple Errors can be emited for a single crate
    - Errors can say where in JSON they occored
        ```
        2:2889:408 not in index or paths, but refered to at '.index."2:2888:104".inner.items[0]'
        2:2890:410 not in index or paths, but refered to at '.index."2:2888:104".inner.items[1]'
        ```
3. Catches more bugs.
    - Because matches are exaustive, all posible variants considered for enums
    - All Id's checked
    - Has already found #101770, #101199 and #100973
    - Id type is also checked, so the Id's in a structs fields can only be field items.
4. Allows the possibility of running from `rustdoc::json`, which we should do in a crator run at some point.

cc ``@CraftSpider``

r? ``@GuillaumeGomez``

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