chore: Rename publisher and brand store roots

[steverydz]

Done

Note: Requires #4984 to be merged first

Renamed the root files for publisher and brand store

How to QA

• Go to https://snapcraft-io-4985.demos.haus/<SNAP_NAME>/listing
• Make sure it loads
• Go to https://snapcraft-io-4985.demos.haus/admin
• Make sure it loads

Testing

• This PR has tests
• No testing required (explain why): No behavioural changes

[webteam-app]

Demo

Jenkins

demos.haus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.01%. Comparing base (b8b6b55) to head (177b617).
Report is 224 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4985       +/-   ##
===========================================
- Coverage   66.80%   53.01%   -13.79%     
===========================================
  Files         113      145       +32     
  Lines        3714     3320      -394     
  Branches      965      525      -440     
===========================================
- Hits         2481     1760      -721     
- Misses       1098     1449      +351     
+ Partials      135      111       -24     

Files with missing lines	Coverage Δ
...er/pages/PublisherSettings/UnregisterSnapModal.tsx	90.00% <ø> (ø)

... and 165 files with indirect coverage changes

[abbiesims]

LGTM 👍