Derive `Eq` for `TcbError`

[nick-mobilecoin]

TcbError now derives Eq. It already had PartialEq and the simple types of the error are total equality types.

[nick-mobilecoin]

Current dependencies on/for this PR:

• main
  • PR #419 👈

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[codecov[bot]]

Codecov Report

Merging #419 (2677621) into main (1bcf459) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #419   +/-   ##
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  Coverage   88.39%   88.39%           
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  Files          40       40           
  Lines        5643     5643           
=======================================
  Hits         4988     4988           
  Misses        655      655           

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[nick-mobilecoin]

closing PartialEq is sufficient for the current consumers