refactor: manipulate entire context instead of TestSetXXX

[hthieu1110]

Linked to #1475

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/stdlibs/testing/testing.go	0.00%	29 Missing ⚠️

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