Is your feature improvement request related to a problem? Please describe.
Tracker for the follow-up tasks for the tedge diag collect feature, which initial PR is #3608.

• Add the summary output to the collection; point 6 in feat: new tedge command to collect diagnostic information tedge diag collect #3608 (comment) => PR feat: tedge diag adds summary output to the archive #3687
• Security enhancement; feat: new tedge command to collect diagnostic information tedge diag collect #3608 (comment) => PR feat: tedge diag collect security enhancement #3698
• Document user guide => PR docs: document tedge diag collect user-guide #3663
• Spinner should output to stderr; point 7 in feat: new tedge command to collect diagnostic information tedge diag collect #3608 (review) => PR fix: redirect log outputs to stderr instead of stdout #3658

From #3646 (comment)

• Plugin improvements (1.-4.) => PR chore: improve diag-plugins and add system tests #3682
• Rename an option from --tarball-name to --name => PR refactor: rename option for output tarball name #3662

• Output the tarball file path to stdout to enable the following usecase => PR chore: tedge diag's tarball path prints out to stdout #3696

OUTPUT_PATH=$(tedge diag collect --name some_file_name)
tedge upload c8y --file "$OUTPUT_PATH"

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