fix(vue-app): empty $fetch function for SSR with static target

[Kolobok12309]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Add empty function $fetch to server fetch mixin
Now while ssr $fetch is undefined, and vue can throw errors on it

Resolves: #8043

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #8053 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #8053   +/-   ##
=======================================
  Coverage   68.98%   68.98%           
=======================================
  Files          91       91           
  Lines        3847     3847           
  Branches     1047     1047           
=======================================
  Hits         2654     2654           
  Misses        969      969           
  Partials      224      224           

Flag	Coverage Δ
#unittests	68.98% <ø> (ø)

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[pi0]

Thanks!