[chore]: enable negative-positive rule from testifylint (#5849)

Testifylint is a linter that provides best practices with the use of
testify.

This PR enables
[negative-positive](https://github.com/Antonboom/testifylint?tab=readme-ov-file#negative-positive)
rule from [testifylint](https://github.com/Antonboom/testifylint)

Signed-off-by: Matthieu MOREL <[email protected]>

Author: mmorel-35

.golangci.yml

@@ -308,5 +308,4 @@ linters-settings:
     disable:
       - float-compare
       - go-require
-      - negative-positive
       - require-error

sdk/metric/internal/aggregate/exponential_histogram_test.go

@@ -180,7 +180,7 @@ func testExpoHistogramMinMaxSumInt64(t *testing.T) {
 
 			assert.Equal(t, tt.expected.max, dp.max)
 			assert.Equal(t, tt.expected.min, dp.min)
-			assert.Equal(t, tt.expected.sum, dp.sum)
+			assert.InDelta(t, tt.expected.sum, dp.sum, 0.01)
 		})
 	}
 }
@@ -222,7 +222,7 @@ func testExpoHistogramMinMaxSumFloat64(t *testing.T) {
 
 			assert.Equal(t, tt.expected.max, dp.max)
 			assert.Equal(t, tt.expected.min, dp.min)
-			assert.Equal(t, tt.expected.sum, dp.sum)
+			assert.InDelta(t, tt.expected.sum, dp.sum, 0.01)
 		})
 	}
 }