UI: fix permission of VNF appliances

[weizhouapache]

Description

This PR fixes #8666

There is no API for listing VNF appliances, use listVnfTemplates as a workaround.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f86c62e) 30.90% compared to head (3dcfc9e) 30.89%.
Report is 1 commits behind head on 4.19.

Additional details and impacted files

@@             Coverage Diff              @@
##               4.19    #8668      +/-   ##
============================================
- Coverage     30.90%   30.89%   -0.01%     
+ Complexity    34188    34179       -9     
============================================
  Files          5347     5347              
  Lines        375567   375578      +11     
  Branches      54626    54629       +3     
============================================
- Hits         116065   116048      -17     
- Misses       244232   244262      +30     
+ Partials      15270    15268       -2     

Flag	Coverage Δ
simulator-marvin-tests	24.75% <ø> (-0.01%)	⬇️
uitests	4.39% <ø> (ø)
unit-tests	16.55% <ø> (-0.01%)	⬇️

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[DaanHoogland]

clgtm

[weizhouapache]

this has been tested by @dataCobra
#8666 (comment)