Rework the precision metric. (#9222)

- Rework the precision metric for both CPU and GPU.
- Mention it in the document.
- Cleanup old support code for GPU ranking metric.
- Deterministic GPU implementation.

* Drop support for classification.

* type.

* use batch shape.

* lint.

* cpu build.

* cpu build.

* lint.

* Tests.

* Fix.

* Cleanup error message.

tests/python/test_eval_metrics.py

@@ -3,7 +3,7 @@ import pytest
 
 import xgboost as xgb
 from xgboost import testing as tm
-from xgboost.testing.metrics import check_quantile_error
+from xgboost.testing.metrics import check_precision_score, check_quantile_error
 
 rng = np.random.RandomState(1337)
 
@@ -315,6 +315,9 @@ class TestEvalMetrics:
     def test_pr_auc_ltr(self):
         self.run_pr_auc_ltr("hist")
 
+    def test_precision_score(self):
+        check_precision_score("hist")
+
     @pytest.mark.skipif(**tm.no_sklearn())
     def test_quantile_error(self) -> None:
         check_quantile_error("hist")