Fix export conditions in Webpack config (#46066)

Currently the export conditions we use for certain runtime, in different
places of the config are totally random. This PR unifies them by
referring to the single constant.

Also adds `worker` as a condition of the edge runtime.

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the
feature request has been accepted for implementation before opening a
PR.
- [ ] Related issues linked using `fixes #number`
- [ ]
[e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs)
tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm build && pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing
doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)

---------

Co-authored-by: JJ Kasper <jj@jjsweb.site>

packages/next/src/build/webpack-config.ts

@@ -902,7 +902,13 @@ export default async function getBaseWebpackConfig(
   const mainFieldsPerCompiler: Record<typeof compilerType, string[]> = {
     [COMPILER_NAMES.server]: ['main', 'module'],
     [COMPILER_NAMES.client]: ['browser', 'module', 'main'],
-    [COMPILER_NAMES.edgeServer]: ['edge-light', 'browser', 'module', 'main'],
+    [COMPILER_NAMES.edgeServer]: [
+      'edge-light',
+      'worker',
+      'browser',
+      'module',
+      'main',
+    ],
   }
 
   const reactDir = path.dirname(require.resolve('react/package.json'))
@@ -1021,7 +1027,13 @@ export default async function getBaseWebpackConfig(
         }
       : undefined),
     mainFields: mainFieldsPerCompiler[compilerType],
-    ...(isEdgeServer && { conditionNames: ['edge-light', 'import', 'node'] }),
+    ...(isEdgeServer && {
+      conditionNames: [
+        ...mainFieldsPerCompiler[COMPILER_NAMES.edgeServer],
+        'import',
+        'node',
+      ],
+    }),
     plugins: [],
   }
 
@@ -1690,7 +1702,11 @@ export default async function getBaseWebpackConfig(
                 resolve: {
                   conditionNames: [
                     'react-server',
-                    ...(!isEdgeServer ? [] : ['edge-light']),
+                    ...mainFieldsPerCompiler[
+                      isEdgeServer
+                        ? COMPILER_NAMES.edgeServer
+                        : COMPILER_NAMES.server
+                    ],
                     'node',
                     'import',
                     'require',