Refactor JWKs related tests

[ldclakmal]

Purpose

$subject

Related to: ballerina-platform/ballerina-library#1010
Related to: ballerina-platform/ballerina-library#584

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #215 (54d08d2) into master (e0449f8) will increase coverage by 0.31%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #215      +/-   ##
============================================
+ Coverage     82.68%   82.99%   +0.31%     
  Complexity       31       31              
============================================
  Files            11       11              
  Lines           641      641              
  Branches        305      305              
============================================
+ Hits            530      532       +2     
+ Misses          105      102       -3     
- Partials          6        7       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/ballerinalang/stdlib/jwt/JwksClient.java	80.67% <0.00%> (+1.68%)	26.00% <0.00%> (ø%)

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