Update testnet branch

[nathanwhit]

Description of proposed changes

Updates testnet branch with latest changes (new PoS testnet chainspec + CLI fixes)

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Practical tips for PR review & merge:

• All GitHub Actions report PASS
• Newly added code/functions have unit tests
  • Coverage tools report all newly added lines as covered
  • The positive scenario is exercised
  • Negative scenarios are exercised, e.g. assert on all possible errors
  • Assert on events triggered if applicable
  • Assert on changes made to storage if applicable
• Modified behavior/functions - try to make sure above test items are covered
• Integration tests are added if applicable/needed

[codecov-commenter]

Codecov Report

Merging #1134 (7e85be2) into testnet (0cc83df) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           testnet    #1134   +/-   ##
========================================
  Coverage    74.62%   74.62%           
========================================
  Files           74       74           
  Lines        10686    10686           
========================================
  Hits          7974     7974           
  Misses        2712     2712           

Impacted Files	Coverage Δ
node/src/chain_spec.rs	0.00% <0.00%> (ø)

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[github-actions]

For full LLVM coverage report click here!