ci: Assorted improvements in MSVC

[amyspark]

Hi @dragonmux,

This PR fixes the following nitpicks with regards to the MSVC jobs:

• they still submitted coverage for the test folder, which we already exclude in the rest of the jobs.
• for the cases where they time out (codegen or deadlock issues?) we'll now submit the test executables and PDB as well, for local testing.

Let me know what you think.

[codecov]

Codecov Report

Merging #67 (606e0cf) into main (eea279f) will decrease coverage by 2.87%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
- Coverage   95.48%   92.62%   -2.87%     
==========================================
  Files          75       48      -27     
  Lines        5831     3390    -2441     
  Branches      610      610              
==========================================
- Hits         5568     3140    -2428     
+ Misses        206      193      -13     
  Partials       57       57              

see 27 files with indirect coverage changes

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[dragonmux]

Nice and simple change set, approved for merge. We'll get this merged once we've seen CI go green (ignoring codecov decreases)