refactor: Refactored FileUtil#getRelativeFilePath to use native Java File capabilities

[manusa]

No description provided.

[codecov]

Codecov Report

Merging #226 into master will increase coverage by 0.11%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##             master     #226      +/-   ##
============================================
+ Coverage     27.28%   27.39%   +0.11%     
- Complexity     1665     1669       +4     
============================================
  Files           353      353              
  Lines         18356    18313      -43     
  Branches       2799     2783      -16     
============================================
+ Hits           5008     5017       +9     
+ Misses        12785    12732      -53     
- Partials        563      564       +1     

Impacted Files	Coverage Δ	Complexity Δ
...va/org/eclipse/jkube/kit/common/util/FileUtil.java	65.51% <88.88%> (+28.59%)	27.00 <4.00> (+4.00)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

94.1% Coverage
0.0% Duplication

The version of Java (1.8.0_131) you have used to run this analysis is deprecated and we will stop accepting it from October 2020. Please update to at least Java 11.
Read more here