fix(ramp): default networks state to array

[wachunei]

Description

This PR fixes incident 642 https://consensys.slack.com/archives/C06TJ8T4K1T

This PR cherry picks this commit 7f7636e (result from merging this PR #9008)

And adds a defaulting mechanism to an empty array for possibly corrupted existing states of the user.

Related issues

Fixes: incident 642 https://consensys.slack.com/archives/C06TJ8T4K1T

Manual testing steps

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Screenshots/Recordings

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[github-actions]

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
44.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[metamaskbot]

No release label on PR. Adding release label release-7.19.1 on PR, as PR was added to branch 7.19.1 when release was cut.