chore: enable files.insertFinalNewline in vscode

[coadler]

Ensures there's always a newline at the end of files. They seem to be
randomly missing, which cause weird diffs.

[codecov]

Codecov Report

Merging #518 (e763fd0) into main (b55a67a) will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #518      +/-   ##
==========================================
- Coverage   68.11%   67.95%   -0.17%     
==========================================
  Files         164      164              
  Lines        9309     9309              
  Branches       85       85              
==========================================
- Hits         6341     6326      -15     
- Misses       2344     2354      +10     
- Partials      624      629       +5     

Flag	Coverage Δ
unittest-go-macos-latest	62.63% <ø> (+0.07%)	⬆️
unittest-go-ubuntu-latest	67.37% <ø> (-0.30%)	⬇️
unittest-go-windows-2022	62.02% <ø> (-0.17%)	⬇️
unittest-js	63.63% <ø> (ø)

Impacted Files	Coverage Δ
provisionersdk/serve.go	35.13% <0.00%> (-8.11%)	⬇️
peerbroker/listen.go	81.35% <0.00%> (-2.55%)	⬇️
peerbroker/proxy.go	57.55% <0.00%> (-1.75%)	⬇️
provisionerd/provisionerd.go	77.20% <0.00%> (-1.48%)	⬇️
coderd/provisionerdaemons.go	57.06% <0.00%> (-0.55%)	⬇️
peer/conn.go	80.81% <0.00%> (-0.52%)	⬇️
peer/channel.go	85.96% <0.00%> (+2.33%)	⬆️
provisionersdk/transport.go	85.10% <0.00%> (+6.38%)	⬆️

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