rebuild: include prefix when filtering with --only

[paul-marechal]

The logic currently ignores a module prefix when filtering packages passed via --only=. This is quite confusing: to only rebuild something like @theia/node-pty we must pass --only=node-pty.

This commit adds a lookup using the prefixed name.

[paul-marechal]

I'm not sure if I should just replace .includes(modulePath) by .includes(`${prefix}{modulePath}`) as it might be breaking?

[codecov-commenter]

Codecov Report

Merging #850 (2d375d0) into master (26cae3d) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #850   +/-   ##
=======================================
  Coverage   75.89%   75.89%           
=======================================
  Files          17       17           
  Lines         672      672           
  Branches      130      130           
=======================================
  Hits          510      510           
  Misses        118      118           
  Partials       44       44           

Impacted Files	Coverage Δ
src/rebuild.ts	66.29% <100.00%> (ø)

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[paul-marechal]

I added tests, but I'll need to close this PR temporarily, I will re-open when ready.

[paul-marechal]

Ready to go again.

[erickzhao]

drafting due to conflicts. i think i can work on resolving them and getting this shipped.