refactor: remove unnecessary in writeFile

[hoangdv2429]

Description

Closes: #2834
This PR will remove unnecessary code as described in the issue.

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Author Checklist

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I have...

• Included the correct type prefix in the PR title
• Added ! to the type prefix if API, client, or state breaking change (i.e., requires minor or major version bump)
• Targeted the correct branch (see PR Targeting)
• Provided a link to the relevant issue or specification
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• Included the necessary unit and integration tests
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• confirmed the correct type prefix in the PR title
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• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage

[p-offtermatt]

LGTM

[sainoe]

It makes the E2E tests fail because writeFile doesn't have the required permissions anymore.

stdout: , stderr: Error: open /home/nonroot/.gaia/config/xxx.json: permission denied

[hoangdv2429]

@sainoe I will check on what's the right option to give in instead of 0o600

[hoangdv2429]

@sainoe can you trigger the test again sir ?

[mpoke]

LGTM. Thanks @hoangdv2429.