txmgr: Disable default batcher tx send timeout

[sebastianst]

With Holocene, batcher transaction ordering has to be strictly preserved, so trying to send a transaction candidate should just never timeout. Note that the txmgr will still bump fees to get a transaction for the same nonce submitted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.29%. Comparing base (bb6f500) to head (fee3aea).
Report is 2 commits behind head on develop.

❗ There is a different number of reports uploaded between BASE (bb6f500) and HEAD (fee3aea). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (bb6f500)	HEAD (fee3aea)
cannon-go-tests-32	1	0
cannon-go-tests-64	1	0

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #13284       +/-   ##
============================================
- Coverage    66.77%   42.29%   -24.48%     
============================================
  Files           56      757      +701     
  Lines         4665    68047    +63382     
============================================
+ Hits          3115    28783    +25668     
- Misses        1378    36887    +35509     
- Partials       172     2377     +2205     

Flag	Coverage Δ
cannon-go-tests-32	?
cannon-go-tests-64	?

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Files with missing lines	Coverage Δ
op-service/txmgr/cli.go	54.29% <ø> (ø)

... and 812 files with indirect coverage changes