Disable npm publish on all non-master branches

[shilman]

Issue: N/A

What I did

Use Lerna's new allowBranch feature to disable publishing on non-master banches to prevent mistakes

lerna/lerna#1026

How to test

Run the following on a non-master branch:

yarn lerna publish --skip-git --skip-npm --npm-tag=block

[codecov]

Codecov Report

Merging #1963 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1963   +/-   ##
=======================================
  Coverage   21.38%   21.38%           
=======================================
  Files         262      262           
  Lines        5757     5757           
  Branches      683      689    +6     
=======================================
  Hits         1231     1231           
+ Misses       4011     4005    -6     
- Partials      515      521    +6

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
lib/ui/src/modules/ui/configs/handle_routing.js	28.04% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
addons/info/src/components/markdown/htags.js	30% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
... and 20 more

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