[Execution] Remove deprecated ingestion engine

[zhangchiqing]

The new execution ingestion engine has been enabled by default. It's been running for over 4 months now since May (v0.33.27) on mainnet EN1 and EN2. The old ingestion engine has been deprecated, and can now be removed.

This PR removes the deprecated execution ingestion engine. It fixes a few test cases that were using the deprecated ingestion engine to use the new ingestion engine. No logic changes.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 23.07692% with 20 lines in your changes missing coverage. Please review.

Project coverage is 41.00%. Comparing base (53a2bca) to head (231d260). Report is 249 commits behind head on master.

Files with missing lines	Patch %	Lines
engine/testutil/nodes.go	0.00%	8 Missing :warning:
cmd/execution_builder.go	0.00%	7 Missing :warning:
cmd/execution_config.go	0.00%	3 Missing :warning:
engine/execution/ingestion/machine.go	0.00%	1 Missing :warning:
engine/testutil/mock/nodes.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6510      +/-   ##
==========================================
- Coverage   41.14%   41.00%   -0.14%     
==========================================
  Files        2020     2018       -2     
  Lines      178778   178127     -651     
==========================================
- Hits        73555    73044     -511     
+ Misses      99062    98969      -93     
+ Partials     6161     6114      -47     

Flag	Coverage Δ
unittests	41.00% <23.07%> (-0.14%)	:arrow_down:

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