build(luals): drop src/.luarc.json, test/.luarc.json #40887

Problem:
emmylua reports `unresolved-require` for `require('test.testutil')` and
friends, and a file under `test/` cannot even resolve its own siblings.

This happens because `test/.emmyrc.json` and `test/.luarc.json`, cause
vim.lsp to root the workspace at `test/` instead of the repo top-level.

Solution:
Drop the nested configs:

    src/.luarc.json
    test/.luarc.json
    test/.emmyrc.json

Outcomes:
- No "libraries" needed: luv types come from `runtime/lua/uv/_meta.lua`,
  not `${3rd}/luv` (which would only duplicate them).
- Drop `test/` from the root `.luarc.json` `ignoreDir` so its modules are
  resolvable by LuaLS/Emmylua.
  - Note: this means that LuaLS diagnostics will now be reported for
    `test/`, but that is not a bad thing...

.luarc.json

@@ -6,8 +6,10 @@
   "workspace": {
     "ignoreDir": [
       ".deps",
-      "build",
-      "test"
+      "build"
+    ],
+    "ignoreGlobs": [
+      "test/**/fixtures/**"
     ],
     "preloadFileSize": 1000,
     "checkThirdParty": "Disable"

src/.luarc.json

@@ -1,25 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/LuaLS/vscode-lua/master/setting/schema.json",
-  "runtime": {
-    "version": "LuaJIT"
-  },
-  "workspace": {
-    "library": [
-      "../runtime/lua",
-      "${3rd}/luv/library"
-    ],
-    "preloadFileSize": 1000,
-    "checkThirdParty": "Disable"
-  },
-  "diagnostics": {
-    "groupFileStatus": {
-      "strict": "Any",
-      "strong": "Any"
-    },
-    "groupSeverity": {
-      "strong": "Warning",
-      "strict": "Warning"
-    },
-    "unusedLocalExclude": [ "_*" ]
-  }
-}

test/.emmyrc.json

@@ -1,25 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/EmmyLuaLs/emmylua-analyzer-rust/refs/heads/main/crates/emmylua_code_analysis/resources/schema.json",
-  "format": {
-    "externalTool": {
-      "program": "stylua",
-      "args": [
-        "-",
-        "--stdin-filepath",
-        "${file}"
-      ]
-    }
-  },
-  "diagnostics": {
-    "disable": [
-      "unnecessary-if"
-    ]
-  },
-  "codeAction": {
-    "insertSpace": true
-  },
-  "strict": {
-    "typeCall": true,
-    "arrayIndex": true
-  }
-}

test/.luarc.json

@@ -1,24 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/LuaLS/vscode-lua/master/setting/schema.json",
-  "runtime": {
-    "version": "LuaJIT"
-  },
-  "workspace": {
-    "library": [
-      "../runtime/lua",
-      "../src"
-    ],
-    "checkThirdParty": "Disable"
-  },
-  "diagnostics": {
-    "groupFileStatus": {
-      "strict": "Opened",
-      "strong": "Opened"
-    },
-    "groupSeverity": {
-      "strong": "Warning",
-      "strict": "Warning"
-    },
-    "unusedLocalExclude": [ "_*" ]
-  }
-}