Fix #387 - prevent JGit from accessing system config to support Gradle configuration cache

[SmialyKot]

As described in the issue - JGit is accessing system config file, which breaks Gradle configuration cache. In order to disable this feature in JGit, we need to supply a new SystemReader without this functionality before initializing JGit repository. This new SystemReader delegates all responsibilities to the original reader, with the exception of loading system config, which is replaced with an empty implementation to prevent access.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f63f2cb) 60.66% compared to head (72d5272) 60.95%.

Files	Patch %	Lines
...structure/git/SystemReaderWithoutSystemConfig.java	92.30%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #683      +/-   ##
============================================
+ Coverage     60.66%   60.95%   +0.29%     
- Complexity      388      398      +10     
============================================
  Files            81       82       +1     
  Lines          1538     1552      +14     
  Branches        146      146              
============================================
+ Hits            933      946      +13     
- Misses          535      536       +1     
  Partials         70       70              

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