build(ui): fix monaco-editor font path

[agilgur5]

Motivation

• the path appears to have changed in newer versions of Monaco
  • but builds seem to have still passed in chore(deps): upgrade monaco-editor to 0.30 #11593
  • it then failed after build(ui): upgrade to Webpack v5 + upgrade loaders + plugins #11628 was merged on top -- likely because the updated CopyWebpackPlugin now actually errors out on a missing file
    • build(ui): upgrade to Webpack v5 + upgrade loaders + plugins #11628 itself passes but was built before chore(deps): upgrade monaco-editor to 0.30 #11593 was merged. The master branch build after merge failed

Modifications

• Update to the new path to monaco-editor's font in the Webpack config
  • this from path is now equivalent to Argo CD's config

Verification

• from argo-workflows/ui/

  • ❯ ls node_modules/monaco-editor/min/vs/base/browser/ui/codicons/codicon/codicon.ttf
    node_modules/monaco-editor/min/vs/base/browser/ui/codicons/codicon/codicon.ttf

  • also there is no codiconLabel directory anymore
• build now passes
• Confirmed that the editor renders with syntax highlighting (so I think it's good?):
  

[terrytangyuan]

Why was build not passing? The CI builds were successful

[agilgur5]

From my opening comment:

The master branch build after merge failed

i.e. when the two PRs were merged together, there was some breakage.
I have a feeling there was breakage before then too with the fonts not working, just that it wasn't detected until we had the newer version of CopyWebpackPlugin which actually errored on build. (i.e. it was a silent error before, now it is quite loud)

[agilgur5]

Also it looks like every PR based off master (except this one) is failing on CI UI 😖