Simplify codecov ignore patterns to focus on task-related tests and runners.

Author: allnes

codecov.yml

@@ -1,12 +1,6 @@
 ignore:
-  - "**/perf_tests/**"
-  - "**/func_tests/**"
-  - "**/all/runner.cpp"
-  - "**/mpi/runner.cpp"
-  - "**/omp/runner.cpp"
-  - "**/seq/runner.cpp"
-  - "**/stl/runner.cpp"
-  - "**/tbb/runner.cpp"
+  - "**/tasks/**/tests/**"
+  - "**/tasks/common/runners/**"
 coverage:
   status:
     project: