tests: use buffer instead of capturer to test logger output

[Hamsajj]

Ticket(s)

addresses #457

Description

Adds the option to write logger console output to a custom io.Writer. This helps with the tests that directly test the logger. Also, enables the use of cobra cmd.Print instead of plain os.Stdout for the logger to help with tests using executeC and root.SetOut.

Development Checklist

• I have added a descriptive title to this PR.
• I have squashed related commits together.
• I have rebased my branch on top of the latest main branch.
• I have performed a self-review of my own code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have added docstring(s) to my code.
• I have made corresponding changes to the documentation (docs).
• I have added tests for my changes.
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[mostafa]

Hey @Hamsajj,

Thanks for your contribution! 🙏