fix(testutil/integration): use only one context in integration test framework

[hoangdv2429]

Description

Closes: #23798
Backport

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[hoangdv2429]

note: fail test what happen with module genesis initialize ? FeePool empty also return collections: not found: key 'no_key' .... Block height of previous test always run with with BlockHeight <=1 at all step, after it is increasing block_height > 1 making tests fail. Should we make the FeePool changing after each block or somehow make the block_height stay < 1 consistently like previous ?

[hoangdv2429]

@aljo242 @technicallyty do you guys have any idea about this ?