npm install --verbose to avoid CircleCI timeout

[mickmister]

Summary

There is currently an issue with plugin projects, where CI will timeout during npm install. There is an issue with fetching dependencies from GitHub, which is causing this step to take longer than usual. Since CircleCI times out after 10 minutes of no console output, this is causing CI to fail for all webapp plugins.

This PR makes it so use the --verbose flag, so the command will have intermediate output, making it so CircleCI does not cancel the build. There is another suggested solution of editing the git config with git config --global url."ssh://git@".insteadOf git://, but we have decided to go with the --verbose approach instead.

More context here:
https://community-daily.mattermost.com/core/pl/ckmtk65jqjr6p8ahmrk9ggu1gh
https://community-daily.mattermost.com/core/pl/h3gdpbm5gpdai8xxmk1jc4k3ro

Ticket Link

Fixes https://mattermost.atlassian.net/browse/MM-44776

[agarciamontoro]

Thanks, @mickmister <3

[codecov-commenter]

Codecov Report

Merging #170 (18708e3) into master (42e4f42) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #170   +/-   ##
======================================
  Coverage    8.42%   8.42%           
======================================
  Files          10      10           
  Lines        1152    1152           
======================================
  Hits           97      97           
  Misses       1047    1047           
  Partials        8       8           

Impacted Files	Coverage Δ
server/manifest.go	100.00% <ø> (ø)

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