Remove crosscompilation code moved to crust

[wojtek-coreum]

Description

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.26%. Comparing base (836525c) to head (c6e5f9c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #784      +/-   ##
==========================================
- Coverage   36.45%   35.26%   -1.19%     
==========================================
  Files         171      171              
  Lines       47469    47469              
==========================================
- Hits        17305    16742     -563     
- Misses      26892    27482     +590     
+ Partials     3272     3245      -27     

Flag	Coverage Δ
coreum	32.01% <ø> (ø)
coreum-integration-tests-modules	16.75% <ø> (-5.76%)	⬇️

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[miladz68]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @wojtek-coreum, and @ysv)

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build/go.mod line 5 at r1 (raw file):

go 1.21

replace github.com/CoreumFoundation/crust/build => ../../crust/build

probably leftover

[wojtek-coreum]

Reviewable status: 2 of 5 files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @miladz68, and @ysv)

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build/go.mod line 5 at r1 (raw file):

Previously, miladz68 (milad) wrote…

probably leftover

yea, thx

[miladz68]

Reviewed 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dzmitryhil and @ysv)

[ysv]

Reviewed 2 of 5 files at r1, 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dzmitryhil)