Do not abort watch mode on errors in watchChange

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
#4424 (but does not resolve it completely)

Description

If there is an error in watchChange, this will make sure this error is displayed the same way as all other errors in watch mode and does not exit Rollup.

Also fixes direct installation of branches from Github via npm@7.

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-4424_throw_watch_change

or load it into the REPL:
https://rollupjs.org/repl/?pr=4427

[codecov]

Codecov Report

Merging #4427 (3f40562) into master (6881753) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4427   +/-   ##
=======================================
  Coverage   98.76%   98.77%           
=======================================
  Files         204      205    +1     
  Lines        7316     7324    +8     
  Branches     2079     2080    +1     
=======================================
+ Hits         7226     7234    +8     
  Misses         33       33           
  Partials       57       57           

Impacted Files	Coverage Δ
src/utils/PluginDriver.ts	100.00% <ø> (ø)
src/watch/watch-proxy.ts	100.00% <ø> (ø)
cli/run/watch-cli.ts	89.70% <100.00%> (ø)
src/Graph.ts	100.00% <100.00%> (ø)
src/watch/WatchEmitter.ts	100.00% <100.00%> (ø)
src/watch/watch.ts	99.09% <100.00%> (+0.04%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6881753...3f40562. Read the comment docs.