Remove platform banners from the applications page

[cstns]

Description

#4885 (comment) nested application pages under team pages, and both injected platform banners.

Removed the application platform-banners and left only the team ones.

Related Issue(s)

introduced by #4885
closes #4938

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.59%. Comparing base (33ac8f7) to head (7e30c3e).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4939      +/-   ##
==========================================
- Coverage   78.64%   78.59%   -0.05%     
==========================================
  Files         324      325       +1     
  Lines       15265    15296      +31     
  Branches     3507     3512       +5     
==========================================
+ Hits        12005    12022      +17     
- Misses       3260     3274      +14     

Flag	Coverage Δ
backend	78.59% <ø> (-0.05%)	⬇️

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