*: switch to BSL preamble

[OisinKyne]

Removes the GPL preamble to go source code, replacing it with BSL preamble.

category: misc
ticket: #1753

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.22 ⚠️

Comparison is base (61348a9) 55.34% compared to head (c1d7b7d) 55.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1839      +/-   ##
==========================================
- Coverage   55.34%   55.13%   -0.22%     
==========================================
  Files         170      170              
  Lines       22332    22332              
==========================================
- Hits        12360    12312      -48     
- Misses       8385     8432      +47     
- Partials     1587     1588       +1     

Impacted Files	Coverage Δ
app/app.go	61.69% <ø> (+0.80%)	⬆️
app/disk.go	33.33% <ø> (ø)
app/errors/context.go	75.00% <ø> (ø)
app/errors/errors.go	79.54% <ø> (ø)
app/errors/go113.go	50.00% <ø> (ø)
app/eth2wrap/eth2wrap.go	61.08% <ø> (ø)
app/eth2wrap/eth2wrap_gen.go	12.18% <ø> (ø)
app/eth2wrap/httpwrap.go	22.76% <ø> (ø)
app/eth2wrap/lazy.go	45.90% <ø> (ø)
app/eth2wrap/success.go	50.00% <ø> (ø)
... and 164 more

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