Fixes "pxt uploadrefs" (#5816)
Fixes "pxt uploadrefs" (#5816)

* remove extra call to cat-file because this caused a race condition

* cli info

* add description and TODOs

* Update cli/gitfs.ts

Co-Authored-By: Michał Moskal <a2df1e659c9fd2578de0a26565357cb273292eeb@moskal.me>

* comment tweaks

switch-education/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,switch-education/pxt,switch-education/pxt,Microsoft/pxt,Microsoft/pxt,Microsoft/pxt,switch-education/pxt