cmd/tendermint/commands: replace $HOME/.some/test/dir with t.TempDir

[tanyabouman]

Closes #6605

[tac0turtle]

Thank you for the contribution. this looks good!! Hope to see you contribute more.

[codecov]

Codecov Report

Merging #6623 (7f4277c) into master (7eef4d7) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6623      +/-   ##
==========================================
- Coverage   60.99%   60.90%   -0.09%     
==========================================
  Files         297      297              
  Lines       28065    28065              
==========================================
- Hits        17119    17094      -25     
- Misses       9222     9241      +19     
- Partials     1724     1730       +6     

Impacted Files	Coverage Δ
privval/signer_server.go	89.47% <0.00%> (-5.27%)	⬇️
privval/signer_endpoint.go	78.78% <0.00%> (-3.04%)	⬇️
internal/consensus/reactor.go	65.89% <0.00%> (-2.92%)	⬇️
internal/statesync/dispatcher.go	87.31% <0.00%> (-2.24%)	⬇️
internal/statesync/block_queue.go	94.39% <0.00%> (-1.87%)	⬇️
internal/consensus/peer_state.go	79.82% <0.00%> (-0.88%)	⬇️
internal/consensus/state.go	67.35% <0.00%> (-0.28%)	⬇️
proxy/multi_app_conn.go	48.05% <0.00%> (ø)
internal/p2p/conn/connection.go	79.12% <0.00%> (+0.54%)	⬆️
internal/statesync/syncer.go	80.60% <0.00%> (+0.76%)	⬆️
... and 2 more