fix(ecau): don't use Promise#finally.

[ROpdebee]

Promise#finally isn't supported in all browsers which we claim to support, so we'll use a polyfill instead of using it directly.

Closes #537.

[ROpdebee]

/deploy-preview for testing.

[github-actions]

This PR changes 1 built userscript(s):

• mb_enhanced_cover_art_uploads (install preview, changes: cdfa7ef)

See all changes

[codecov]

Codecov Report

Merging #542 (b442936) into main (c8d33a9) will decrease coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
- Coverage   99.55%   99.17%   -0.38%     
==========================================
  Files          57       57              
  Lines        1335     1341       +6     
  Branches      209      212       +3     
==========================================
+ Hits         1329     1330       +1     
- Misses          6        8       +2     
- Partials        0        3       +3     

Impacted Files	Coverage Δ
src/lib/util/async.ts	100.00% <100.00%> (ø)
src/lib/util/observable.ts	100.00% <100.00%> (ø)
...rc/mb_enhanced_cover_art_uploads/providers/base.ts	96.42% <0.00%> (-3.58%)	⬇️
src/mb_enhanced_cover_art_uploads/fetch.ts	96.70% <0.00%> (-3.30%)	⬇️

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[github-actions]

🚀 Released 1 new userscript version(s):

• mb_enhanced_cover_art_uploads 2022.8.3.2 in a1f3c6a