fix: orchestrion fail to instrument if is not in the go.mod folder

[RomainMuller]

Load the configuration from the module root instead of the current working directory, so that it no longer fails when building a package in a sub-directory.

Fixes #464

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 63.96%. Comparing base (4d4eb9b) to head (322ec8f).

Files with missing lines	Patch %	Lines
internal/toolexec/aspect/oncompile.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #466      +/-   ##
==========================================
- Coverage   63.96%   63.96%   -0.01%     
==========================================
  Files         184      184              
  Lines       11084    11089       +5     
==========================================
+ Hits         7090     7093       +3     
- Misses       3461     3462       +1     
- Partials      533      534       +1     

Components	Coverage Δ
Generators	76.15% <ø> (ø)
Instruments	73.41% <ø> (ø)
Go Driver	78.62% <ø> (ø)
Toolexec Driver	74.21% <66.66%> (-0.08%)	⬇️
Aspects	78.75% <ø> (ø)
Injector	77.27% <ø> (ø)
Job Server	67.07% <ø> (ø)
Integration Test Suite	57.48% <ø> (ø)
Other	63.96% <66.66%> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
internal/toolexec/aspect/oncompile.go	71.90% <66.66%> (-0.52%)	⬇️