refactor: omit unnecessary reassignment

[spuradage]

The new version of Go has been optimized, and variables do not need to be reassigned.

For more info: https://tip.golang.org/wiki/LoopvarExperiment#does-this-mean-i-dont-have-to-write-x--x-in-my-loops-anymore

[graphite-app]

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[macroscopeapp]

Remove per-iteration reassignment in blockchain test subtests to omit unnecessary variable rebinding

Refactor test loops to let subtest closures capture the range variable directly by removing tc := tc and tt := tt rebinding lines in blockchain admin and publisher tests, including parallel subtests in blockchain_publisher_test.go.

📍Where to Start

Start with the subtest loops in app_chain_admin_test.go, then review parallel subtests in blockchain_publisher_test.go and related patterns in settlement_chain_admin_test.go.

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[fbac]

Thank you!