Add missing test output directories to .gitignore

Add test_autoarray/inversion/plot/files/ and test_autoarray/plot/files/
which are generated by running tests but were not previously ignored.

https://claude.ai/code/session_01B9sVEV54XWCa2LJw1C8gvv

Author: claude

.gitignore

@@ -12,6 +12,8 @@ test_autoarray/dataset/plot/files/
 test_autoarray/fit/plot/files/
 test_autoarray/structures/arrays/one_d/files/array/
 test_autoarray/structures/plot/files/
+test_autoarray/inversion/plot/files/
+test_autoarray/plot/files/
 test_autoarray/instruments/files/
 
 .envr