feat(feature-activation): configure NOP features on testnet

[glevco]

Depends on #760

Motivation

Configure the NOP features in testnet according to the definition in the Phased Testing RFC.

Acceptance Criteria

• Configure NOP features in testnet.yml and testnet.py

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Merging #761 (29d9ec3) into master (5fbcd4e) will decrease coverage by 0.03%.
Report is 7 commits behind head on master.
The diff coverage is 59.09%.

❗ Current head 29d9ec3 differs from pull request most recent head fd5941d. Consider uploading reports for the commit fd5941d to get more accurate results

@@            Coverage Diff             @@
##           master     #761      +/-   ##
==========================================
- Coverage   84.73%   84.70%   -0.03%     
==========================================
  Files         253      252       -1     
  Lines       21801    21801              
  Branches     2953     2954       +1     
==========================================
- Hits        18473    18467       -6     
- Misses       2684     2692       +8     
+ Partials      644      642       -2     

Files Changed	Coverage Δ
hathor/builder/cli_builder.py	74.48% <ø> (ø)
hathor/manager.py	81.83% <43.75%> (-0.94%)	⬇️
hathor/builder/builder.py	91.79% <100.00%> (+0.27%)	⬆️
hathor/conf/testnet.py	100.00% <100.00%> (ø)
hathor/feature_activation/settings.py	100.00% <100.00%> (ø)
hathor/version.py	85.29% <100.00%> (ø)

... and 8 files with indirect coverage changes

The base branch was changed.