docs: document additional_dependencies for pre-commit plugin hooks

Using a third-party commitizen plugin (e.g. cz-conventional-gitmoji)
with the pre-commit/prek "commitizen" hook fails with "The committer
has not been found in the system" because pre-commit installs each
hook in its own isolated environment, so the plugin package is not
available unless it is listed in additional_dependencies.

Add a tip to the pre-commit tutorial explaining this and showing the
working additional_dependencies configuration.

Closes #1141

Author: akashchamp

docs/tutorials/auto_check.md

@@ -50,6 +50,19 @@ repos:
 !!! tip "Using the latest version"
     Replace `v4.10.0` with the latest commitizen version. You can find the latest version on [GitHub releases](https://github.com/commitizen-tools/commitizen/releases) or use a specific commit SHA for pinning to an exact version.
 
+!!! tip "Using a third-party commitizen plugin"
+    If your project uses a [third-party plugin](../third-party-plugins/about.md) (for example, a custom `name` such as `cz_gitmoji` from [cz-conventional-gitmoji](../third-party-plugins/cz-conventional-gitmoji.md)), add the plugin package to `additional_dependencies`. `prek`/`pre-commit` installs each hook in its own isolated environment, so the plugin is not available unless it is listed explicitly, and the hook fails with an error such as `The committer has not been found in the system`:
+
+    ```yaml
+    repos:
+      - repo: https://github.com/commitizen-tools/commitizen
+        rev: v4.10.0  # Use the latest version or a specific version
+        hooks:
+          - id: commitizen
+            stages: [commit-msg]
+            additional_dependencies: ["cz-conventional-gitmoji"]
+    ```
+
 #### Step 3: Install the hook
 
 Install the configuration into Git's hook system: