chore(test): skip vault-decryption e2e test if extension directory not available

[legobeat]

Description

The vault decryptor test is documented as failing in an e2e setting (see comment for getExtensionStorageFilePath) due to the extension data directory not being available on the file system.

This skips the remainder of the test (which would otherwise throw an error) if the expected directory does not exist.

Related issues

• 24413

Manual testing steps

• Run yarn test:e2e:single test/e2e/vault-decryption-chrome.spec.js --browser chrome --retries 2

Screenshots/Recordings

Before

After

Pre-merge author checklist

• [x] I’ve followed MetaMask Coding Standards.
• [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 format if applicable
• [x] I’ve applied the right labels on the PR (see labeling guidelines). 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.

[github-actions[bot]]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.48%. Comparing base (e3207d4) to head (8b417d6).

:exclamation: Current head 8b417d6 differs from pull request most recent head 6677820. Consider uploading reports for the commit 6677820 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #24399 +/- ## =========================================== - Coverage 67.48% 67.48% -0.00% =========================================== Files 1288 1288 Lines 50153 50153 Branches 13023 13023 =========================================== - Hits 33842 33841 -1 - Misses 16311 16312 +1 ```

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