fix(ci): melos variable substitution for the codecov upload step

[Leptopoda]

Somewhere in the changes yesterday the variable substitution broke.
For whatever stupid reason melos will inject them when not specified with a $ sign.
https://melos.invertase.dev/environment-variables

[provokateurin]

How is this supposed to work without any $ at all?

[Leptopoda]

melos magc (see the linked docs). It's stupid I know.

I was not able to get it working with the proper $ variables (although I would prefer using them).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.63%. Comparing base (955e6eb) to head (2b37288).
Report is 12 commits behind head on main.

❗ Current head 2b37288 differs from pull request most recent head a06f47b. Consider uploading reports for the commit a06f47b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1831   +/-   ##
=======================================
  Coverage   44.63%   44.63%           
=======================================
  Files         114      114           
  Lines        3802     3802           
=======================================
  Hits         1697     1697           
  Misses       2105     2105           

Flag	Coverage Δ
neon_dashboard	92.56% <ø> (?)
neon_framework	37.36% <ø> (?)
neon_talk	100.00% <ø> (?)

[Leptopoda]

It must have been something with the double quoting. After removing them it also works with the $ sign.
Let's see

[provokateurin]

Report is still empty 🤔

[Leptopoda]

Ok we really need to remove the dollar signs.

[provokateurin]

The report finally looks good 👍

[provokateurin]

Don't forget to remove the test commit!