Remove file-loader dependency (#15196)

- Upgrade webpack to 5.28 to enable publicPath option
- Use asset modules in place of deprecated file-loader

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

package-lock.json

@@ -3514,37 +3514,6 @@
         "flat-cache": "^3.0.4"
       }
     },
-    "file-loader": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/file-loader/-/file-loader-6.2.0.tgz",
-      "integrity": "sha512-qo3glqyTa61Ytg4u73GultjHGjdRyig3tG6lPtyX/jOEJvHif9uB0/OCI2Kif6ctF3caQTW2G5gym21oAsI4pw==",
-      "requires": {
-        "loader-utils": "^2.0.0",
-        "schema-utils": "^3.0.0"
-      },
-      "dependencies": {
-        "loader-utils": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-2.0.0.tgz",
-          "integrity": "sha512-rP4F0h2RaWSvPEkD7BLDFQnvSf+nK+wr3ESUjNTyAGobqrijmW92zc+SO6d4p4B1wh7+B/Jg1mkQe5NYUEHtHQ==",
-          "requires": {
-            "big.js": "^5.2.2",
-            "emojis-list": "^3.0.0",
-            "json5": "^2.1.2"
-          }
-        },
-        "schema-utils": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.0.0.tgz",
-          "integrity": "sha512-6D82/xSzO094ajanoOSbe4YvXWMfn2A//8Y1+MUqFAJul5Bs+yn36xbK9OtNDcRVSBJ9jjeoXftM6CfztsjOAA==",
-          "requires": {
-            "@types/json-schema": "^7.0.6",
-            "ajv": "^6.12.5",
-            "ajv-keywords": "^3.5.2"
-          }
-        }
-      }
-    },
     "fill-range": {
       "version": "7.0.1",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
@@ -8551,9 +8520,9 @@
       }
     },
     "webpack": {
-      "version": "5.27.1",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.27.1.tgz",
-      "integrity": "sha512-rxIDsPZ3Apl3JcqiemiLmWH+hAq04YeOXqvCxNZOnTp8ZgM9NEPtbu4CaMfMEf9KShnx/Ym8uLGmM6P4XnwCoA==",
+      "version": "5.28.0",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.28.0.tgz",
+      "integrity": "sha512-1xllYVmA4dIvRjHzwELgW4KjIU1fW4PEuEnjsylz7k7H5HgPOctIq7W1jrt3sKH9yG5d72//XWzsHhfoWvsQVg==",
       "requires": {
         "@types/eslint-scope": "^3.7.0",
         "@types/estree": "^0.0.46",