T7396: Return the old script to generate tech-support archive

[sever-sever]

Change summary

Return the old script to generate tech-support archive command, introduced in #3746
The machine-readable format is good, but useless for analysis. There are no logs and other necessary information.

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): Return old script to generate tech-support arcive

Related Task(s)

• https://vyos.dev/T7396

Related PR(s)

How to test / Smoketest result

Before changes, we got JSON format which is not good to analyse the system issue.

vyos@r14:~$ generate tech-support archive 
vyos@r14:~$ 
vyos@r14:~$ ls -lah | grep json
-rw-r--r-- 1 vyos users  57K Apr 25 12:29 .json.gz
vyos@r14:~$ 

After the change, we get the required format:

vyos@r14:~$ generate tech-support archive 
Debug file is generated and located in /tmp/r14_tech-support-archive_2025-04-25T12-34-47.tar.gz
vyos@r14:~$ 
vyos@r14:~$ ls -lah /tmp | grep gz
-rw-r--r-- 1 root root      4.3M Apr 25 12:35 r14_tech-support-archive_2025-04-25T12-34-47.tar.gz
vyos@r14:~$ 

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

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[github-actions]

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• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed