chore: chore/7.39.0-Changelog (#13043)

This PR updates the change log for 7.39.0 and generates the test plan
here
[commit.csv](https://github.com/MetaMask/metamask-mobile/blob/release/7.39.0/commits.csv)

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Co-authored-by: metamaskbot <[email protected]>
Co-authored-by: sethkfman <[email protected]>