[direct to 5.16] collect DB upgrade logs in noobaa diagnostics

[dannyzaken]

Explain the changes

1. Collect DB upgrade logs in noobaa diagnostics
2. Using kubctl cp to copy the files to the diags dir

Issues: Fixed #xxx / Gap #xxx

1. https://issues.redhat.com/browse/DFBUGS-4134

Testing Instructions:

• Doc added/updated
• Tests added

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