Fixed unicodedecode exception for reading fwts session log (BugFix)

[KaiChuan-Hsieh]

Description

Try to capture the unicodedecode exception but not making the script crashed

Resolved issues

Fixes: SOMERVILLE-807

Tests

The test was performed by running the script to parse the problem session log, the script can handle the problem session log without crashing.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 45.77%. Comparing base (b92edc5) to head (0dcfce8).
Report is 135 commits behind head on main.

Files with missing lines	Patch %	Lines
...kbox-support/checkbox_support/scripts/fwts_test.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1448      +/-   ##
==========================================
+ Coverage   45.72%   45.77%   +0.04%     
==========================================
  Files         367      367              
  Lines       39134    39163      +29     
  Branches     6618     6622       +4     
==========================================
+ Hits        17894    17926      +32     
+ Misses      20565    20562       -3     
  Partials      675      675              

Flag	Coverage Δ
checkbox-support	59.98% <85.71%> (+0.28%)	⬆️

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[KaiChuan-Hsieh]

@pieqq

Hello,

Could you help to review the MP? thanks.