Add the option to customize kopia cmd log level

[redgoat650]

Change Overview

Add the option to run kopia commands with arbitrary log level values. All default log level settings remain unchanged if no option is provided.

This change adds the ability to choose the log level when generating kopia commands by providing a LogLevel option in the CommandArgs structure.

I agree to the DCO for all the commits in this PR.

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Test Plan

# cd pkg/kopia/command
# go test
OK: 18 passed
PASS
ok      github.com/kanisterio/kanister/pkg/kopia/command        0.045s

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

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[pavannd1]

LGTM