chore!: consolidate test package

[cmwaters]

The large diff is purely from renaming directories and changing import paths. There is no change to the code.

This PR consolidates our testing based packages into a single test package

[codecov-commenter]

Codecov Report

Merging #1647 (53f2ccf) into main (8c1fcb5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1647   +/-   ##
=======================================
  Coverage   50.96%   50.96%           
=======================================
  Files          92       92           
  Lines        5751     5751           
=======================================
  Hits         2931     2931           
  Misses       2520     2520           
  Partials      300      300           

Impacted Files	Coverage Δ
test/tokenfilter/setup.go	100.00% <ø> (ø)
test/txsim/account.go	67.44% <ø> (ø)
test/txsim/blob.go	80.64% <ø> (ø)
test/txsim/client.go	78.88% <ø> (ø)
test/txsim/run.go	61.81% <ø> (ø)
test/txsim/send.go	89.65% <ø> (ø)
test/txsim/stake.go	65.21% <ø> (ø)
test/util/testnode/full_node.go	82.87% <ø> (ø)
test/util/testnode/node_init.go	64.17% <ø> (ø)
test/util/testnode/node_interaction_api.go	58.97% <ø> (ø)
... and 3 more

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[rach-id]

LGTM

[evan-forbes]

thanks for tidying up 🙂