#412 - LogViewer - small patches in widget core

[przemekxa]

Description

Modified the widget:

• removed ALL from the list of possible log levels
• the configuration is not deleted during redeployment
• added the ability to enter the SSH private key when adding or editing a credential
• added the ability to enter the URL starting with ssh:// when adding or editing an endpoint

Motivation and Context

#412

Screenshots

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• Automated functional tests have been added or modified to cover my changes (if applicable)
• I have updated the documentation accordingly.

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I hereby agree to the terms of the Cogboard Contributor License Agreement.

[janeksmielowski]

czy nie byłoby lepiej dodać wgrywanie pliku z kluczem?