Add NextJS install step (#273)

## Problem

The [most
recent](https://github.com/pinecone-io/pinecone-ts-client/actions/runs/10602693291)
e2e Edge workflow run failed because it still couldn't find `NextJS`.

<img width="1280" alt="Screenshot 2024-08-28 at 11 58 38 AM"
src="https://github.com/user-attachments/assets/d681c35b-6655-4599-8f07-2b20d9b673d2">


## Solution

I removed the `includeFiles` section in order to avoid limiting Vercel's
project scope in any unintended way + added an explicitly `npm install`
step that installs `NextJS` globally.

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [x] Infrastructure change (CI configs, etc)
- [ ] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

.github/actions/e2e-testing/edge/action.yml

@@ -63,6 +63,10 @@ runs:
       run: npm install pinecone-database-pinecone-*.tgz
       shell: bash
 
+    - name: Install NextJS explicitly
+      run: npm install -g next@latest
+      shell: bash
+
     - name: Install pnpm
       run: npm install -g pnpm
       shell: bash
@@ -97,7 +101,6 @@ runs:
           "functions": {
             "src/app/**/*.{ts,tsx}": {
               "runtime": "edge",
-              "includeFiles": "src/app/**/*"
             }
           }
         }' > vercel.json