smoketest: T8087: reorganize folderstructure for embedded configttests

[c-po]

Change summary

Configuration files for config tests gathered from lab installations, customers or our own networks were placed in multiple directories - all related to the same thing.

We have had config-tests, configs and config.no-load. This commit re-arranges all the files and places a proper README for the users.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T8087

Related PR(s)

• smoketest: T8087: reorganize folderstructure for embedded configttests vyos-1x#4893

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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