Remove bundle upsell message and UI

[lesleyjanenorton]

Description

This PR removes...

• The privacy bundle in-app message
• The upgrade paths in ViewSubscriptionManagement and related tidbits

Reference

https://mozilla.slack.com/archives/C0291CWG53K/p1663716976010969

Checklist

• [ ] My code follows the style guidelines for this project
• [ ] I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• [ ] I have performed a self review of my own code
• [ ] I have commented my code PARTICULARLY in hard to understand areas
• [ ] I have added thorough tests where needed

[codecov-commenter]

Codecov Report

Base: 27.08% // Head: 70.51% // Increases project coverage by +43.43% :tada:

Coverage data is based on head (1b6e73c) compared to base (6b86681). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4513       +/-   ##
===========================================
+ Coverage   27.08%   70.51%   +43.43%     
===========================================
  Files         252      255        +3     
  Lines       14208    15945     +1737     
  Branches     8081     8070       -11     
===========================================
+ Hits         3848    11244     +7396     
- Misses       4246     4306       +60     
+ Partials     6114      395     -5719     

Flag	Coverage Δ
lottie_tests	56.33% <ø> (+39.43%)	:arrow_up:
qml_tests	7.65% <ø> (+0.02%)	:arrow_up:
unit_tests	71.01% <ø> (+43.06%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/constants.h	75.00% <ø> (+41.66%)	:arrow_up:
src/featureslist.h	0.00% <ø> (ø)
src/models/subscriptiondata.cpp	0.67% <ø> (+0.67%)	:arrow_up:
src/models/subscriptiondata.h	0.00% <ø> (ø)
src/urlopener.cpp	43.75% <ø> (+26.23%)	:arrow_up:
src/urlopener.h	100.00% <ø> (ø)
src/signature.cpp	100.00% <0.00%> (ø)
src/rfc/rfc1918.cpp	0.00% <0.00%> (ø)
src/rfc/rfc4193.cpp	0.00% <0.00%> (ø)
src/rfc/rfc5735.cpp	0.00% <0.00%> (ø)
... and 173 more

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[lesleyjanenorton]

@bakulf sounds good! Will close this for now in that case.