Make dbSaveBloomFilterError pixel daily and continuous

[diegoreymendez]

Task/Issue URL: https://app.asana.com/0/1199230911884351/1205962557569232/f
iOS PR: duckduckgo/iOS#2526

Description

We're making the dbSaveBloomFilterError pixel fire daily and continuously to be able to better understand impact (ie: number of users affected).

Testing:

Pre-test setup:

For reference the pixel is m_mac_debug_dbsb

1. You'll want to comment out this line.
2. Run the app once and enable pixels logging from Debug Menu > Logging > Pixel
3. Stop the app and consider running defaults delete com.duckduckgo.daily.pixel.storage m_mac_debug_dbsb to clear out the relevant daily pixel from storage.
4. Check out BSK locally, and include it in the project.
5. You'll want to comment out this line.
6. Change this line, so that we're doing throw NSError(domain: "test", code: 5) instead of saving the context.

Test: Ensure you see the pixel firing daily and count

1. Launch Console.app, select your mac and filter by category:Pixel
2. Run the app
3. Wait a few seconds, then ensure Console.app shows both these pixels:

m.mac.debug.dbsb.d {
    d = testing;
    e = 5;
}

and

m.mac.debug.dbsb.c {
    d = testing;
    e = 5;
}

---

Internal references:

Pull Request Review Checklist
Software Engineering Expectations
Technical Design Template
Pull Request Documentation

[diegoreymendez]

I don't want changing this pixel to be within scope here.

[bwaresiak]

LGTM!