[test] Have real epoch_manager as default for tests

[shreyan-gupta]

In an effort to kill mock epoch manager, this PR makes the default test environment have real epoch managers.

All tests that still do require a mock epoch manager (for whatever reason), can call builder.mock_epoch_managers().

Over time we would slowly like to get rid of all calls to mock_epoch_managers()

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c6afdd7) 72.05% compared to head (d3b7ae9) 72.02%.

Files	Patch %	Lines
chain/client/src/test_utils/test_env_builder.rs	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10598      +/-   ##
==========================================
- Coverage   72.05%   72.02%   -0.03%     
==========================================
  Files         725      725              
  Lines      147195   147183      -12     
  Branches   147195   147183      -12     
==========================================
- Hits       106054   106013      -41     
- Misses      36294    36313      +19     
- Partials     4847     4857      +10     

Flag	Coverage Δ
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linux	71.07% <90.90%> (+<0.01%)	⬆️
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sanity-checks	1.26% <0.00%> (+<0.01%)	⬆️
unittests	67.92% <90.90%> (-0.02%)	⬇️
upgradability	0.13% <0.00%> (+<0.01%)	⬆️

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[Longarithm]

Makes sense, this is simply a small renaming with many occurrences, from what I see

[shreyan-gupta]

Makes sense, this is simply a small renaming with many occurrences, from what I see

Yep! Now we can focus on getting rid of these calls to mock_epoch_manager