🌱 adopt externally-set GO_BUILD_FLAGS

[grokspawn]

Description

Providing the capability for targets to adopt GO_BUILD_FLAGS if set in the environment. Specifically, this is useful when shifting from a compile environment which assumes no vendoring to one which assumes vendoring.

Existing uses for this were just for unit tests, so those have been shifted to a new GO_BUILD_EXTRA_FLAGS variable.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.98%. Comparing base (a2ae8b8) to head (d7c4196).
Report is 2 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #1881 +/- ##
==========================================
+ Coverage 68.93% 68.98% +0.05% 
==========================================
Files 66 66 Lines 5243 5243 ==========================================
+ Hits 3614 3617 +3 + Misses 1397 1395 -2 + Partials 232 231 -1 

Flag	Coverage Δ
e2e	50.46% <ø> (+0.07%)	⬆️
unit	56.72% <ø> (ø)

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