Add "parent directory match" priority between exact and host match

[m5w6]

This is a change for browser integration with "Return only best-matching credentials". It adds an additional priority level for "parent directory match" between "exact url match" and "FQDN match".

Fixes #6892
(I have slightly changed the first proposal so that only new lines are added.)

Testing strategy

• Enable browser integration
• Enable "Return only best-matching credentials"
• Create a first KeePassXC entry with URL https://www.example.net/ (no path!)
• Create a second KeePassXC entry with URL https://www.example.net/second/
• Visit https://www.example.net/first/ (any subdirectory except /second/ – should have a login form)
• KeePassXC-Browser should only offer username/password from the first but not the second entry

Type of change

• ✅ New feature (change that adds functionality)

[droidmonkey]

need to update testbrowser expectations for sort value.