Parent #13328 & 13329

This PR adds tracking to the backup download and restore flows.

Removing the DRAFT label - questions have been clarified
(1) Which errors should be tracked ** ONLY Errors that are shown to the user **

• Response errors from post requests
• Other request running - is this really an error? Yes, it is
• Response errors from fetching status
  Missing/null parameters

(2) Request types and escaped strings

• Turning a json object into a string prints escaped quotes - not sure this is the format we want to track
  JSON is good to send.

To test:

• Launch App
• Turn on feature flags for backup download, restore, and backup
• Turn on collection information (Me -> App Settings -> Privacy Settings -> Collection information switch)

• Navigate to the Activity Log
• Tap on more menu for an item
• Tap on the Restore to this point option
• Check log for 🔵 Tracked: jetpack_restore_opened, Properties: {"source":"activity_log"}
• Tap on Restore Site
• Tap on Confirm
• Check log for 🔵 Tracked: jetpack_restore_confirmed, Properties: {"restore_types":"{"sqls":true,"themes":true,"contents":true,"plugins":true,"roots":true,"uploads":true}"}
• Tap on Let me know when finished button
• Check log for 🔵 Tracked: jetpack_restore_notify_me_button_tapped

• Navigate to the Backup
• Tap on more menu for an item
• Tap on the Restore to this point option
• Check log for 🔵 Tracked: jetpack_restore_opened, Properties: {"source":"backup"}
• Close out of restore

• Navigate to the Activity Log
• Tap on more menu for an item
• Tap on the Download Backup point option
• Check log for 🔵 Tracked: jetpack_backup_download_opened, Properties: {"source":"activity_log"}
• Tap on Create downloadable file
• Check log for 🔵 Tracked: jetpack_backup_download_confirmed, Properties: {"restore_types":"{"sqls":true,"themes":true,"contents":true,"plugins":true,"roots":true,"uploads":true}"}
• Wait for process to finish
• Tap on Share Link Button
• Check log for 🔵 Tracked: jetpack_backup_download_share_link_tapped
• Tap on Download File Button
• Check log for 🔵 Tracked: jetpack_backup_download_file_download_tapped
• Close out of Backup Download

• Navigate to Backup
• Tap on more menu for an item
• Tap on the Download Backup point option
• Check log for 🔵 Tracked: jetpack_backup_download_opened, Properties: {"source":"backup"}
• Close out of backup download

• Navigate to the Activity Log
• Tap on more menu for an item
• Tap on the Download Backup point option
• Tap on Create downloadable file
• Check log for 🔵 Tracked: jetpack_backup_download_notify_me_button_tapped
• Close out of Backup Download

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.