Update web-features tags (#26306)

Author: mdn-bot

css/properties/scroll-marker-group.json

@@ -4,6 +4,9 @@
       "scroll-marker-group": {
         "__compat": {
           "spec_url": "https://drafts.csswg.org/css-overflow-5/#scroll-marker-group-property",
+          "tags": [
+            "web-features:scroll-markers"
+          ],
           "support": {
             "chrome": {
               "version_added": "135"
@@ -39,6 +42,9 @@
         "after": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-overflow-5/#valdef-scroll-marker-group-after",
+            "tags": [
+              "web-features:scroll-markers"
+            ],
             "support": {
               "chrome": {
                 "version_added": "135"
@@ -75,6 +81,9 @@
         "before": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-overflow-5/#valdef-scroll-marker-group-before",
+            "tags": [
+              "web-features:scroll-markers"
+            ],
             "support": {
               "chrome": {
                 "version_added": "135"
@@ -111,6 +120,9 @@
         "none": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-overflow-5/#valdef-scroll-marker-group-none",
+            "tags": [
+              "web-features:scroll-markers"
+            ],
             "support": {
               "chrome": {
                 "version_added": "135"

css/selectors/scroll-marker-group.json

@@ -5,6 +5,9 @@
         "__compat": {
           "description": "`::scroll-marker-group`",
           "spec_url": "https://drafts.csswg.org/css-overflow-5/#scroll-marker-group-pseudo",
+          "tags": [
+            "web-features:scroll-markers"
+          ],
           "support": {
             "chrome": {
               "version_added": "135"

css/selectors/scroll-marker.json

@@ -5,6 +5,9 @@
         "__compat": {
           "description": "`::scroll-marker`",
           "spec_url": "https://drafts.csswg.org/css-overflow-5/#scroll-marker-pseudo",
+          "tags": [
+            "web-features:scroll-markers"
+          ],
           "support": {
             "chrome": {
               "version_added": "135"

css/types/gradient.json

@@ -243,7 +243,7 @@
               "description": "Single color stop and 0-1 positions",
               "spec_url": "https://drafts.csswg.org/css-images-4/#color-stop-syntax",
               "tags": [
-                "web-features:conic-gradients"
+                "web-features:single-color-gradients"
               ],
               "support": {
                 "chrome": {
@@ -578,7 +578,7 @@
               "description": "Single color stop and 0-1 positions",
               "spec_url": "https://drafts.csswg.org/css-images-4/#color-stop-syntax",
               "tags": [
-                "web-features:gradients"
+                "web-features:single-color-gradients"
               ],
               "support": {
                 "chrome": {
@@ -1035,7 +1035,7 @@
               "description": "Single color stop and 0-1 positions",
               "spec_url": "https://drafts.csswg.org/css-images-4/#color-stop-syntax",
               "tags": [
-                "web-features:gradients"
+                "web-features:single-color-gradients"
               ],
               "support": {
                 "chrome": {