finish migrating to webpack 5

[RayBB]

Closes

• Update dependency webpack to v5 #8066
• Update dependency webpack5 to v5.88.2 #8062
• Update dependency webpack-cli to v5 #8067
• Update dependency workbox-webpack-plugin to v6.6.0 #8063

Enables #8257

Follows #5245

Technical

I followed the guide here: https://webpack.js.org/migrate/5/

We were pretty much already using webpack 5 thanks to #5245 but now we are fully moved over.

Note: I'm pretty sure we have to upgrade vue cli and webpack together because of the dependency.

We did the babel/eslint upgrade in #8312

Testing

Well building works and a quick look at the site thing seem fine.

Stakeholders

@jimchamp @mekarpeles

[mekarpeles]

I heard on our last staff call that maybe this will be blocked by vue 2->3 and may benefit from Tuesday call discussion

[RayBB]

@mekarpeles
@vue/cli-service v5 depends on webpack 5 per this. Also v4 of @vue/cli-service doesn't work with webpack 5 so they must be upgraded together.

However, as far as I can tell, this has no impact on vue 2 support and the components compile and work fine.

But I'll try to join the call to better understand the concern.

[codecov-commenter]

Codecov Report

Merging #8309 (e6c0b2e) into master (126af2b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8309   +/-   ##
=======================================
  Coverage   16.66%   16.66%           
=======================================
  Files          83       83           
  Lines        4422     4422           
  Branches      757      757           
=======================================
  Hits          737      737           
  Misses       3202     3202           
  Partials      483      483           

[jimman2003]

I concur that vue-cli v5 is compatible with vue 2, at least according to the vue 2.6 to 2.7 migration guide

[cdrini]

I tossed this on testing and it built successfully and library explorer and the author identifier component work swimmingly! Lgtm!