release(runway): cherry-pick fix: Remove tabs permission to avoid new warnings cp-13.10.1 (#38146)

- fix: Remove `tabs` permission to avoid new warnings cp-13.10.1
(#38075)

## **Description**

The recent addition of the `tabs` permission will result in new
permission warnings upon update, which is extremely disruptive and is
something we'd never do except as a last resort.

The permission wasn't actually needed, and has been removed. This
removal uncovered a bug in our Webpack build (the `tabs` permission was
erroneously only added for MV2 test builds, but we need it for MV3 test
builds as well), which has been fixed.

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## **Changelog**

CHANGELOG entry: Remove unnecessary extension permission

## **Related issues**

N/A

## **Manual testing steps**

Test that the sidepanel still works in general. Particularly with dapp
confirmations, and the "Connected status" indicator, and current
selected dapp.

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**

<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding

Standards](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling

guidelines](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Removes the `tabs` permission from the MV3 base manifest.
> 
> - **Manifest (MV3)**:
> - Update `app/manifest/v3/_base.json` to remove `permissions` entry
`tabs`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7778231. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->


[bba4201](bba4201)

Co-authored-by: Mark Stacey <[email protected]>

Author: runway-github[bot]

app/manifest/v3/_base.json

@@ -77,7 +77,6 @@
     "notifications",
     "scripting",
     "storage",
-    "tabs",
     "unlimitedStorage",
     "webRequest",
     "offscreen",