Deselect PCA dtype test for sklearn=1.4 (#2666)

* Deselect PCA dtype test for sklearn=1.4 * Change comment * Change deselection condition * Move to public tests section * Update comment

Author: Alexsandruss

deselected_tests.yaml

@@ -447,6 +447,12 @@ public:
  - decomposition/tests/test_pca.py::test_pca_array_api_compliance[PCA(n_components=2,svd_solver='covariance_eigh')-check_array_api_input_and_values-array_api_strict-None-None] >=1.5,<1.6
  - decomposition/tests/test_pca.py::test_pca_array_api_compliance[PCA(n_components=2,svd_solver='covariance_eigh',whiten=True)-check_array_api_input_and_values-array_api_strict-None-None] >=1.5,<1.6
 
+ # sklearn 1.4 has different absolute and relative tolerances for this test,
+ # set of available solvers and corresponding sklearnex rules to choose one
+ # than newer versions resulting in test failure on some systems when
+ # single-threaded computation is used which is a frequent case for CI
+ - decomposition/tests/test_pca.py::test_pca_dtype_preservation[full] <1.5
+
  # --------------------------------------------------------
  # The following tests currently fail with GPU offloading
 gpu: