Respect config values for evm & vm bridge setup

[m-Peter]

Description

The default values for SetupEVMEnabled & SetupVMBridgeEnabled are true.
However, if for whatever reason, someone tries to set false for these two, it isn't possible to do so.
Because the option is only appended when conf.SetupEVMEnabled & conf.SetupVMBridgeEnabled are set to true.

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[bluesign]

I think also need to sanitize those; conf.SetupEVMEnabled = False & conf.SetupVMBridgeEnabled = True does not seem to be a valid case.

PS: I recall seeing some issue or comment, saying EVM disabled is not a valid case anymore somewhere.
found it: onflow/flow-go#7507

Maybe removing EVMEnabled flag, and just keeping Bridge flag makes sense, what do you think @m-Peter ?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.45%. Comparing base (96c4f80) to head (4e2f7bc).
Report is 86 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #827      +/-   ##
==========================================
- Coverage   35.30%   34.45%   -0.85%     
==========================================
  Files          47       45       -2     
  Lines        7418     7345      -73     
==========================================
- Hits         2619     2531      -88     
- Misses       4610     4632      +22     
+ Partials      189      182       -7     

Flag	Coverage Δ
unittests	34.45% <100.00%> (-0.85%)	⬇️

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[m-Peter]

@bluesign You are indeed right 💯

I was merely trying to solve a bug in the first place, to fix the CI for onflow/flow-evm-gateway#832 .
I haven't followed along on these VM Bridge changes, so I'll wait for @jribbink to jump in, as he may have more context on how to properly proceed with the changes.