fix: allow BTC revert with dust amount v22

[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 64.40%. Comparing base (c268463) to head (1355d2d).
Report is 1 commits behind head on release/v22.

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/v22    #3140      +/-   ##
===============================================
- Coverage        64.41%   64.40%   -0.02%     
===============================================
  Files              412      412              
  Lines            28992    28998       +6     
===============================================
  Hits             18676    18676              
- Misses            9528     9534       +6     
  Partials           788      788              

Files with missing lines	Coverage Δ
zetaclient/chains/bitcoin/observer/outbound.go	32.67% <0.00%> (ø)
zetaclient/chains/bitcoin/signer/signer.go	17.98% <0.00%> (-0.34%)	⬇️

[brewmaster012]

LGTM