tests: fix e2e subs goal-partkey-commands

[algorandskiy]

Summary

goal-partkey-commands was extremely buggy:

1. Uses non-initialized gcmd and INITIAL_ACCOUNT
2. Does not check if cmd fails (no set -e)
3. Part key command output parsing was invalid.
4. Sometimes it raced with some other test and failed to correctly compare part keys. This was fixed by binding goal cmd to a wallet (the runner creates unique wallets for each test).

Also added TESTFILTER handling to e2e-subs so it can run a single test now (similarly to expect tests).

Test Plan

This is a test fix, passed locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.23%. Comparing base (d2c4ca7) to head (76fa7dc).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6095      +/-   ##
==========================================
- Coverage   56.26%   56.23%   -0.04%     
==========================================
  Files         489      489              
  Lines       69637    69637              
==========================================
- Hits        39182    39157      -25     
- Misses      27796    27817      +21     
- Partials     2659     2663       +4     

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