fix: flaky test vault decrypt due to SRP hold time (#25328)

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## **Description**
This fixes another point of flakiness for the vault decrypt test. The
logs show:

```
[driver] Called 'holdMouseDownOnElement' with arguments [{"text":"Hold to reveal SRP","tag":"span"},2000]
[driver] Called 'findElement' with arguments ["[data-testid=\"srp_text\"]"]
Failure on testcase: 'undefined', for more information see the artifacts tab in CI
```

The problem is that the holding time is not long enough so the srp
element cannot be found. To repro, you can make a small time for the
holding, and you'll see you hit the error. For fixing it we increase the
holding time so we make sure that we'll always hold it until the
required amount of time, within any variation of ci environment


https://github.com/MetaMask/metamask-extension/assets/54408225/3251f205-4802-4f88-bcee-5a93203119a0

- ci :
https://app.circleci.com/pipelines/github/MetaMask/metamask-extension/87595/workflows/a9d135e4-ecef-44b6-a564-e8e3ca6813b5/jobs/3210020/steps

Fix: 


https://github.com/MetaMask/metamask-extension/assets/54408225/db882cfa-ca2e-4a18-9a15-c0b740def439





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## **Related issues**

Fixes: #25329

## **Manual testing steps**

1. Go to this page...
2.
3.

## **Screenshots/Recordings**

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### **Before**

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### **After**

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## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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test/e2e/helpers.js

@@ -638,7 +638,7 @@ const tapAndHoldToRevealSRP = async (driver) => {
       text: tEn('holdToRevealSRP'),
       tag: 'span',
     },
-    2000,
+    3000,
   );
 };