T671: do not preserve old tech-support report implementation

[jestabro]

Change Summary

This is needed after
vyos/vyatta-op#67
to expose the tech-support node and avoid empty node error.

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):
  Remove old/dead code.

Related Task(s)

• https://vyos.dev/T671

Component(s) name

Proposed changes

How to test

Checklist:

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

[c-po]

@Mergifyio backport sagitta

[mergify]

backport sagitta

✅ Backports have been created

• #2261 T671: do not preserve old tech-support report implementation (backport #2260) has been created for branch sagitta