Fix IllegalStateException when plugin is applied in pluginManagement

[bgalek]

Wrap the rootGradle.rootProject access in a try/catch. When the root project is not yet available, fall back to project.rootProject.layout.projectDirectory — the local included build's own root, which is always available at this stage.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.59%. Comparing base (2035137) to head (70f1edc).

Files with missing lines	Patch %	Lines
...egro/tech/build/axion/release/ReleasePlugin.groovy	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1018      +/-   ##
============================================
- Coverage     59.69%   59.59%   -0.10%     
  Complexity      451      451              
============================================
  Files            84       84              
  Lines          1841     1844       +3     
  Branches        149      149              
============================================
  Hits           1099     1099              
- Misses          683      686       +3     
  Partials         59       59              

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