Add single_color_stop to repeating-{conic,linear,radial}-gradient() (#26508)

Add single_color_stop to `repeating-conic/linear/radial-gradient()`

In the original PR #26062, the following three gradient functions were missed:

- repeating-conic-gradient()
- repeating-linear-gradient()
- repeating-radial-gradient()

```css
.test {
  background: repeating-conic-gradient(red);
}
```

Author: yisibl

css/types/gradient.json

@@ -1176,6 +1176,41 @@
                 "deprecated": false
               }
             }
+          },
+          "single_color_stop": {
+            "__compat": {
+              "description": "Single color stop and 0-1 positions",
+              "spec_url": "https://drafts.csswg.org/css-images-4/#color-stop-syntax",
+              "support": {
+                "chrome": {
+                  "version_added": "135"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "136"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": "18.4"
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror",
+                "webview_ios": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "repeating-linear-gradient": {
@@ -1436,6 +1471,41 @@
               }
             }
           },
+          "single_color_stop": {
+            "__compat": {
+              "description": "Single color stop and 0-1 positions",
+              "spec_url": "https://drafts.csswg.org/css-images-4/#color-stop-syntax",
+              "support": {
+                "chrome": {
+                  "version_added": "135"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "136"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": "18.4"
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror",
+                "webview_ios": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
           "to": {
             "__compat": {
               "description": "`to` keyword",
@@ -1857,6 +1927,41 @@
                 "deprecated": false
               }
             }
+          },
+          "single_color_stop": {
+            "__compat": {
+              "description": "Single color stop and 0-1 positions",
+              "spec_url": "https://drafts.csswg.org/css-images-4/#color-stop-syntax",
+              "support": {
+                "chrome": {
+                  "version_added": "135"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "136"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": "18.4"
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror",
+                "webview_ios": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         }
       }