Add a --clean argument to jbrowse upgrade to clean up old files

[cmdcolin]

Adds a --clean argument to jbrowse upgrade

Uses rimraf to clean the static directory

Fixes #2337

We could also consider making this the default behavior and not using --clean as an extra argument but it's maybe the 'safest' option since it would ensure that we don't delete anything unless a user confirms they want to delete stuff

[codecov]

Codecov Report

Merging #2761 (0df0d00) into main (beaac0e) will decrease coverage by 0.02%.
The diff coverage is 33.33%.

❗ Current head 0df0d00 differs from pull request most recent head af091d1. Consider uploading reports for the commit af091d1 to get more accurate results

@@            Coverage Diff             @@
##             main    #2761      +/-   ##
==========================================
- Coverage   60.21%   60.19%   -0.03%     
==========================================
  Files         571      571              
  Lines       26590    26595       +5     
  Branches     6476     6477       +1     
==========================================
- Hits        16012    16008       -4     
- Misses      10253    10262       +9     
  Partials      325      325              

Impacted Files	Coverage Δ
products/jbrowse-cli/src/commands/upgrade.ts	74.35% <25.00%> (-8.00%)	⬇️
products/jbrowse-cli/src/base.ts	82.50% <100.00%> (ø)
packages/core/TextSearch/TextSearchManager.ts	96.55% <0.00%> (-3.45%)	⬇️
...inearGenomeView/components/RefNameAutocomplete.tsx	77.77% <0.00%> (-3.04%)	⬇️
.../linear-genome-view/src/LinearGenomeView/index.tsx	83.81% <0.00%> (-0.17%)	⬇️

---

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 beaac0e...af091d1. Read the comment docs.

[garrettjstevens]

I like this idea, but I think having certain behaviors that rely on certain versions of Node is potentially confusing. I'd rather bump the version in "engines" in package.json (Node 12 is EOL in a couple months anyway), or use code that doesn't depend on Node 14.

[cmdcolin]

sounds reasonable, can probably use rimraf npm module for example

[cmdcolin]

using rimraf now:)