TofuUserApprovalHandler: Refactor setAuthTime.

[thomasmey]

Extract actual getting into getAuthTime.
Ensure to not create a new HTTP session.

[codecov-io]

Codecov Report

Merging #1501 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##             master   #1501      +/-   ##
===========================================
- Coverage     25.21%   25.2%   -0.01%     
  Complexity      912     912              
===========================================
  Files           209     209              
  Lines         11689   11693       +4     
  Branches       2116    2116              
===========================================
  Hits           2947    2947              
- Misses         8227    8231       +4     
  Partials        515     515

Impacted Files	Coverage Δ	Complexity Δ
.../openid/connect/token/TofuUserApprovalHandler.java	0% <0%> (ø)	0 <0> (ø)	⬇️

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