tests: add test for large payments with high gas

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What does this pull request do? Explain your changes. (required)

Adds a test to show minimum Gateway reserve when gas spikes happen.

go-livepeer uses avgGasPrice and redeemGasL2 to calculate tx cost when gas spikes happen. The result is 0.36 ETH (3 gwei * 1,200,00 * 100) will enable Gateways to not have down time when gas spikes happen.

Specific updates (required)

• Added a test to show 0.36 ETH will not fail to produce tickets.

How did you test each of these updates (required)

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.67052%. Comparing base (c492248) to head (c5541b3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3748         +/-   ##
===================================================
- Coverage   31.67308%   31.67052%   -0.00256%     
===================================================
  Files            159         159                 
  Lines          38970       38970                 
===================================================
- Hits           12343       12342          -1     
- Misses         25734       25735          +1     
  Partials         893         893                 

see 4 files with indirect coverage changes

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@leszko do you think this test should be in the code base? It just demonstrates the minimum required ETH reserve during gas spikes with the avg gas cost calcs. I did it to illustrate how it works for #3746.

We did also update Gateway docs so maybe that is enough. https://docs.livepeer.org/gateways/guides/fund-gateway#deposit-gateway-funds-via-livepeer-cli

[leszko]

@leszko do you think this test should be in the code base? It just demonstrates the minimum required ETH reserve during gas spikes with the avg gas cost calcs. I did it to illustrate how it works for #3746.

We did also update Gateway docs so maybe that is enough. https://docs.livepeer.org/gateways/guides/fund-gateway#deposit-gateway-funds-via-livepeer-cli

Is there any reason for not keeping it in the codebase? If not, then I'll merge this one in.