refactor: Replace vfolder's status_history's type map with list

[jopemachine]

It is a part of #767.

The current implementation saves only the most recent timestamp whenever status information in status_history is updated, and all previous information is deleted.

This PR prevents the loss of timestamp information by changing the data structure of vfolders' status_history to List.

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Mention to the original issue

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[jopemachine]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• refactor: Replace vfolder's status_history's type map with list #2116 👈
• chore: Add dummy_kernels table for testing sql_json_merge #2115
• refactor: Replace sessions, kernels's status_history's type map with list #2113
• main

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[achimnol]

Revised the PR description from "Partially resolves #767" to "It is a part of #767" to prevent accidental closing of the referenced issue as "resolves #NNN" is the pattern to be recognized as the full resolution of the issue.