[Feature request] Searchfox links to instances that matches resolved bug

In DevTools code, it's not uncommon for us to reference Bug numbers in comments to indicate something can be done once the bug is fixed (for example: devtools/client/shared/output-parser.js#1432).

I was thinking it would be nice if the bot could put a comment with a Searchfox search results of Bug XXX when a Bug XXX is resolved, so the authors could be notified about potential cleanup followups.

Searchfox will return some nice JSON objects when calling it with a json header:

var urlSearchParams = new URLSearchParams({
  q: "Bug 711942"
});
var url = `https://searchfox.org/mozilla-central/search?${urlSearchParams}`;
var response = await fetch(url, {
  headers: {
    'Accept': 'application/json, text/javascript, */*; q=0.01'
  }
});
await response.json()

returns

{
  "normal": {
    "Textual Occurrences": [
      {
        "path": "devtools/client/shared/output-parser.js",
        "lines": [
          {
            "lno": 1432,
            "bounds": [
              9,
              19
            ],
            "line": "      // Bug 711942 will add a tooltip to edit angle values and we should"
          }
        ]
      }
    ]
  },
  "*title*": "Bug 711942",
  "*timedout*": false
}

So here autonag could print something along those lines:

"Bug 711942" references were found in the code:
- "// Bug 711942 will add a tooltip to edit angle values and we should" in [devtools/client/shared/output-parser.js#1432](https://searchfox.org/mozilla-central/rev/ac7a567f036e1954542763f4722fbfce041fb752/devtools/client/shared/output-parser.js#1432)

where the path would be a link to Searchfox (e.g. )

I don't know if that's a pattern used by other teams, but our team would benefit from it.

Start with the Searchfox search endpoint and its JSON response example, then trace the autonag path that handles resolved bugs and posts comments. Done means the bot can identify matching “Bug XXX” references and post comments containing Searchfox links and matching source lines.