[skip-changelog] Migrate tests from test_compile_part_3.py to compile_part_3_test.go

[MatteoPologruto]

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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
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What kind of change does this PR introduce?

Infrastructure Enhancement

What is the new behavior?

This PR is a followup to PR #1806
Integration tests that were previously present in test_compile_part_3.py have been rewritten in compile_part_3_test.go, without changing their original purpose.
More informations on the tests can be found checking the single commits.

Does this PR introduce a breaking change, and is titled accordingly?

No

[codecov]

Codecov Report

Base: 36.84% // Head: 0.00% // Decreases project coverage by -36.84% ⚠️

Coverage data is based on head (08d25b5) compared to base (fb9d4a8).
Patch has no changes to coverable lines.

❗ Current head 08d25b5 differs from pull request most recent head 8a8df2b. Consider uploading reports for the commit 8a8df2b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #1906       +/-   ##
==========================================
- Coverage   36.84%       0   -36.85%     
==========================================
  Files         235       0      -235     
  Lines       19763       0    -19763     
==========================================
- Hits         7282       0     -7282     
+ Misses      11650       0    -11650     
+ Partials      831       0      -831     

Flag	Coverage Δ
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Impacted Files	Coverage Δ
internal/integrationtest/arduino-cli.go
legacy/builder/builder.go
...der/wipeout_build_path_if_build_options_changed.go
commands/lib/utils.go
executils/null.go
arduino/security/signatures.go
commands/upgrade/upgrade.go
cli/generatedocs/generatedocs.go
configuration/defaults.go
legacy/builder/container_setup.go
... and 225 more

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[umbynos]

Left some notes

[MatteoPologruto]

I've rearranged some tests following PR #1913. I left the ones that are not using arduino:avr as a core and the ones that are modifying either boards.local.txt or platform.local.txt in compile_part_3_test.go.

[umbynos]