feat(vue-app): use EventSource instead of WebSocket for build indicator

[Atinux]

…sockets

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

EventSource are better than Websockets and avoid the limitation of X connected sockets, might also solve Nuxt hanging on reload.

⚠️ This should be merged after nuxt/loading-screen#34 and upgrading the loading-screen dependency.

Checklist:

• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #6186 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #6186   +/-   ##
=======================================
  Coverage   95.74%   95.74%           
=======================================
  Files          80       80           
  Lines        2655     2655           
  Branches      683      683           
=======================================
  Hits         2542     2542           
  Misses         97       97           
  Partials       16       16

Flag	Coverage Δ
#e2e	100% <ø> (ø)	⬆️
#fixtures	50.8% <ø> (ø)	⬆️
#unit	92.42% <ø> (ø)	⬆️

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[pi0]

SSE working fine!