emoji: Don't generate emoji farms corresponding to now banned emojisets.

This will help us in reducing the size of the release tarball
significantly. I have refrained from changing the `EMOJISETS`
constant in the `emoji_setup_utils.py` as that controls the
emojisets that we want to support. Since we want to re-enable
the feature of changing emojisets sometime again in the future
that variable should be kept as it is as it controls several
other things like emoji scripts that we use to generate emoji
names. Changing it might cause hard to catch bugs.

package.json

@@ -11,10 +11,7 @@
     "clipboard": "2.0.1",
     "css-hot-loader": "1.3.9",
     "css-loader": "0.28.11",
-    "emoji-datasource-apple": "4.0.4",
-    "emoji-datasource-emojione": "4.0.4",
     "emoji-datasource-google": "4.0.4",
-    "emoji-datasource-twitter": "4.0.4",
     "error-stack-parser": "2.0.1",
     "expose-loader": "0.7.5",
     "file-loader": "1.1.11",

tools/setup/emoji/build_emoji

@@ -140,7 +140,7 @@ def setup_emoji_farm(cache_path: str, emoji_data: List[Dict[str, Any]]) -> None:
         dst_file = os.path.join(target_emoji_farm, img_file_name)
         shutil.copy2(src_file, dst_file)
 
-    for emojiset in EMOJISETS:
+    for emojiset in ['google']:
         # Copy individual emoji images from npm packages.
         src_emoji_farm = os.path.join(
             NODE_MODULES_PATH, 'emoji-datasource-' + emojiset, 'img', emojiset, '64')

version.py

@@ -8,4 +8,4 @@ ZULIP_VERSION = "1.9.0-rc1+git"
 # Typically, adding a dependency only requires a minor version bump, and
 # removing a dependency requires a major version bump.
 
-PROVISION_VERSION = '25.7'
+PROVISION_VERSION = '26.0'