Opt-in auto update global installation

[medikoo]

Closes: #8088

[codecov-io]

Codecov Report

Merging #8428 into master will decrease coverage by 0.64%.
The diff coverage is 51.09%.

@@            Coverage Diff             @@
##           master    #8428      +/-   ##
==========================================
- Coverage   88.04%   87.39%   -0.65%     
==========================================
  Files         249      254       +5     
  Lines        9299     9476     +177     
==========================================
+ Hits         8187     8282      +95     
- Misses       1112     1194      +82     

Impacted Files	Coverage Δ
lib/plugins/standalone/index.js	41.02% <23.07%> (+9.65%)	⬆️
lib/utils/eventuallyUpdate.js	26.53% <26.53%> (ø)
lib/utils/npmPackage/isWritable.js	41.66% <41.66%> (ø)
lib/utils/standalone.js	68.75% <68.75%> (ø)
lib/plugins/config/config.js	82.85% <72.00%> (-6.04%)	⬇️
lib/utils/npmPackage/isGlobal.js	90.90% <90.90%> (ø)
lib/Serverless.js	96.93% <100.00%> (+0.06%)	⬆️
lib/plugins/deploy/deploy.js	100.00% <100.00%> (ø)
lib/plugins/interactiveCli/autoUpdate.js	100.00% <100.00%> (ø)
lib/plugins/interactiveCli/index.js	100.00% <100.00%> (ø)
... and 7 more

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