fix(vue-app): use nuxt globalName correctly in nuxt-link and fetch mixin

[danielroe]

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

History: this.$nuxt accidentally crept in in the static target PR (#6159). This caused an error which was solved by testing for this.$nuxt rather than using globalName (#7766) as is done elsewhere in the component (see #4743)

This PR reverts to using globalName.

Resolves #8118

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-io]

Codecov Report

Merging #8289 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #8289   +/-   ##
=======================================
  Coverage   68.70%   68.70%           
=======================================
  Files          91       91           
  Lines        3863     3863           
  Branches     1051     1051           
=======================================
  Hits         2654     2654           
  Misses        982      982           
  Partials      227      227           

Flag	Coverage Δ
unittests	68.70% <ø> (ø)

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[danielroe]

e2e tests should pass when #8282 is merged

[kswedberg]

thank you!