Misc fixes for operations

[awrichar]

Ensure the operations for tokens and custom contracts behave as expected in success/failure scenarios.

[codecov-commenter]

Codecov Report

Merging #498 (01e00fa) into main (cf27fa9) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #498   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          267       267           
  Lines        15251     15266   +15     
=========================================
+ Hits         15251     15266   +15     

Impacted Files	Coverage Δ
internal/assets/token_pool.go	100.00% <100.00%> (ø)
internal/assets/token_transfer.go	100.00% <100.00%> (ø)
internal/contracts/manager.go	100.00% <100.00%> (ø)
internal/database/sqlcommon/operation_sql.go	100.00% <100.00%> (ø)
internal/events/dx_callbacks.go	100.00% <100.00%> (ø)
internal/events/operation_update.go	100.00% <100.00%> (ø)
internal/events/token_pool_created.go	100.00% <100.00%> (ø)
internal/txcommon/txcommon.go	100.00% <100.00%> (ø)
pkg/fftypes/operation.go	100.00% <100.00%> (ø)

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[peterbroadhurst]

👍