Ignore error for making identical deals

[xinaxu]

In the case where provider failed to return success response, Singularity will retry the same deal which may end up with being rejected as boost has already received the same deal proposal.

This makes Singularity continue to next deal instead of keep retrying on the same "identical deal" error message.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (0820a8e) 74.09% compared to head (51d0824) 74.14%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
service/dealpusher/dealpusher.go	0.00%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #427      +/-   ##
==========================================
+ Coverage   74.09%   74.14%   +0.05%     
==========================================
  Files         150      150              
  Lines        9940     9944       +4     
==========================================
+ Hits         7365     7373       +8     
+ Misses       1819     1816       -3     
+ Partials      756      755       -1     

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