refactor: replace all remaining uses of num_shards() with shard_ids()

[akhi3030]

Closes #10237

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (935cc98) 71.80% compared to head (b4d0dd4) 71.76%.

Files	Patch %	Lines
chain/client/src/debug.rs	0.00%	4 Missing ⚠️
core/store/src/genesis/initialization.rs	60.00%	2 Missing ⚠️
chain/epoch-manager/src/adapter.rs	50.00%	1 Missing ⚠️
tools/amend-genesis/src/lib.rs	0.00%	1 Missing ⚠️
tools/fork-network/src/storage_mutator.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10271      +/-   ##
==========================================
- Coverage   71.80%   71.76%   -0.05%     
==========================================
  Files         711      711              
  Lines      142942   142936       -6     
  Branches   142942   142936       -6     
==========================================
- Hits       102646   102580      -66     
- Misses      35569    35625      +56     
- Partials     4727     4731       +4     

Flag	Coverage Δ
backward-compatibility	0.08% <0.00%> (+<0.01%)	⬆️
db-migration	0.08% <0.00%> (+<0.01%)	⬆️
genesis-check	1.26% <0.00%> (+<0.01%)	⬆️
integration-tests	36.11% <51.72%> (-0.11%)	⬇️
linux	71.65% <68.96%> (-0.01%)	⬇️
linux-nightly	71.37% <68.96%> (-0.04%)	⬇️
macos	55.03% <53.57%> (+<0.01%)	⬆️
pytests	1.48% <0.00%> (+<0.01%)	⬆️
sanity-checks	1.28% <0.00%> (+<0.01%)	⬆️
unittests	68.13% <53.57%> (-0.04%)	⬇️
upgradability	0.13% <0.00%> (+<0.01%)	⬆️

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