Purge Jessie time-based APT snapshots

Originally created by @intrigeri on #11912 (Redmine)

Related issues

• Related to tails/sysadmin#12605
• Related to tails/tails#12096
• Related to tails/sysadmin#13526
• Blocked by tails/tails#10289
• Blocks tails/sysadmin#13233
• Blocked by tails/tails#11738