fix: handle NoEstimateAvailable text error body

[zone117x]

This PR was published to npm with the version 6.10.1-pr.ccf1faa.0
e.g. npm install @stacks/[email protected] --save-exact

The latest stacks-node in the next branch can have an error response as a text body (as opposed to json). Not sure if this is a regression in the stacks-node. Either way, this PR will handle the case of a NoEstimateAvailable text body response.

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Name	Status	Preview	Updated (UTC)
stacksjs-docs	✅ Ready (Inspect)	Visit Preview	Dec 10, 2023 1:15pm

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (debeb00) 66.18% compared to head (ccf1faa) 66.33%.
Report is 33 commits behind head on main.

Files	Patch %	Lines
packages/cli/src/cli.ts	82.35%	3 Missing ⚠️
packages/transactions/src/clarity/prettyPrint.ts	93.33%	3 Missing ⚠️
packages/transactions/src/cl.ts	60.00%	2 Missing ⚠️
packages/transactions/src/transaction.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1603      +/-   ##
==========================================
+ Coverage   66.18%   66.33%   +0.15%     
==========================================
  Files         118      119       +1     
  Lines        8640     8695      +55     
  Branches     1908     1936      +28     
==========================================
+ Hits         5718     5768      +50     
- Misses       2685     2692       +7     
+ Partials      237      235       -2     

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[janniks]

Thanks 🎈