test: adds pr permissions to bot (#29923)

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## **Description**
This PR adds missing permissions for pull-requests to update fixtures
that is currently failing with 403.

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## **Changelog**

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CHANGELOG entry:

## **Related issues**

Fixes:
https://consensys.slack.com/archives/CBW7S9FSN/p1778252290987909?thread_ts=1778240496.951059&cid=CBW7S9FSN

## **Manual testing steps**
N/A

## **Screenshots/Recordings**

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- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] 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-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

#### Performance checks (if applicable)

- [ ] I've tested on Android
  - Ideally on a mid-range device; emulator is acceptable
- [ ] I've tested with a power user scenario
- Use these [power-user
SRPs](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/edit-v2/401401446401?draftShareId=9d77e1e1-4bdc-4be1-9ebb-ccd916988d93)
to import wallets with many accounts and tokens
- [ ] I've instrumented key operations with Sentry traces for production
performance metrics
- See [`trace()`](/app/util/trace.ts) for usage and
[`addToken`](/app/components/Views/AddAsset/components/AddCustomToken/AddCustomToken.tsx#L274)
for an example

For performance guidelines and tooling, see the [Performance
Guide](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/400085549067/Performance+Guide+for+Engineers).

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- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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- [ ] I confirm that this PR addresses all acceptance criteria described
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk: only adjusts GitHub Actions job `permissions` for the
comment-triggered dispatcher, with no application/runtime code changes.
> 
> **Overview**
> Fixes the `Update E2E Fixtures` workflow’s comment-triggered
`dispatch` job by explicitly granting **`actions: write`** and
**`pull-requests: write`** (plus `contents: read`) permissions.
> 
> This allows the bot command (`@metamaskbot update-mobile-fixture`) to
successfully re-dispatch the workflow onto the PR branch and post PR
comments without hitting 403 permission errors.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
d449d9d. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: christopherferreira9

.github/workflows/update-e2e-fixtures.yml

@@ -36,6 +36,10 @@ jobs:
       }}
     runs-on: ubuntu-latest
     timeout-minutes: 5
+    permissions:
+      actions: write
+      contents: read
+      pull-requests: write
     steps:
       - uses: actions/checkout@v4