test(term): add refreshing expired jwt test case

[ymgyt]

Describe your changes

add refreshing expired google jwt test case

[codecov]

Codecov Report

Attention: Patch coverage is 98.76543% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.76%. Comparing base (6e9a19d) to head (bf6d249).

Files	Patch %	Lines
crates/synd_test/src/mock/mod.rs	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   85.39%   86.76%   +1.37%     
==========================================
  Files         105      106       +1     
  Lines        7278     7331      +53     
  Branches     7278     7331      +53     
==========================================
+ Hits         6215     6361     +146     
+ Misses        817      719      -98     
- Partials      246      251       +5     

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