chore: disable snaps feat from main temporarily (#10278)

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## **Description**

This PR disable preinstalled-snaps from main build since no feature will
be using it at this point. The first feature relying on
preinstalled-snap (signing-snap) is notifications, which is not part of
the current release.

## **Related issues**

Fixes:

## **Manual testing steps**

N/A

## **Screenshots/Recordings**

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before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

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

## **Pre-merge reviewer checklist**

- [x] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [x] 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.

metro.transform.js

@@ -19,7 +19,7 @@ const availableFeatures = new Set([
   'beta',
 ]);
 
-const mainFeatureSet = new Set(['preinstalled-snaps']);
+const mainFeatureSet = new Set([]);
 const flaskFeatureSet = new Set([
   'flask',
   'preinstalled-snaps',