Remove duplicate imports

[farazdagi]

What type of PR is this?

Other

What does this PR do? Why is it needed?

• Go allows importing the same package under different aliases, however, this is randomly intentional (only when we deliberately want to expose methods under different scopes, say, preparing for the future refactoring).
• This PR removes multiple imports of the same packages, where they seem to be introduced unintentionally.

Which issues(s) does this PR fix?

N/A

Other notes for review

• With imports of state, I opted for stateTrie variant as it is less likely to be shadowed by local vars (it is easy to imagine how one defines local var named state which overshadows imported package name; stateTrie is less likely for a local name).

[codecov]

Codecov Report

Merging #7491 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7491   +/-   ##
=======================================
  Coverage   60.74%   60.74%           
=======================================
  Files         426      426           
  Lines       30485    30485           
=======================================
  Hits        18517    18517           
  Misses       8950     8950           
  Partials     3018     3018