fix: allow BTC revert with dust amount v20

[lumtis]

Description

Check if the amount for a BTC revert outbound is below dust amount. In this case, cancel the tx (same logic as restricted address where there will be a tx but with 0 btc), cctx will be reverted.

Add a E2E test to test revert with dust amount. To check the effect, the "dustAmount" can be set to false in ZetaClient, the test will be stall because the outbound can't be signed

[coderabbitai]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 65.94%. Comparing base (7e0a192) to head (8a324de).
Report is 1 commits behind head on release/v20.

Files with missing lines	Patch %	Lines
zetaclient/chains/bitcoin/signer/signer.go	0.00%	12 Missing ⚠️
zetaclient/chains/bitcoin/observer/outbound.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release/v20    #3141      +/-   ##
===============================================
- Coverage        65.96%   65.94%   -0.02%     
===============================================
  Files              364      364              
  Lines            25357    25363       +6     
===============================================
  Hits             16726    16726              
- Misses            7999     8005       +6     
  Partials           632      632              

Files with missing lines	Coverage Δ
zetaclient/chains/bitcoin/observer/outbound.go	32.67% <0.00%> (ø)
zetaclient/chains/bitcoin/signer/signer.go	18.09% <0.00%> (-0.34%)	⬇️

[brewmaster012]

LGTM