feat: extend fqcn rule to complain on collections keyword

src/ansiblelint/rules/fqcn.md

@@ -10,6 +10,7 @@ The `fqcn` rule has the following checks:
 - `fqcn[action]` - Use FQCN for module actions, such ...
 - `fqcn[action-core]` - Checks for FQCNs from the `ansible.legacy` or `ansible.builtin` collection.
 - `fqcn[canonical]` - You should use canonical module name ... instead of ...
+- `fqcn[keyword]` - You shouldn't use the `collections` keyword, use the FQCNs instead.
 
 ```{note}
 In most cases you should declare the `ansible.builtin` collection for internal Ansible actions.

src/ansiblelint/rules/fqcn.py

@@ -7,6 +7,7 @@
 
 from ansible.plugins.loader import module_loader
 
+from ansiblelint.constants import LINE_NUMBER_KEY
 from ansiblelint.errors import MatchError
 from ansiblelint.file_utils import Lintable
 from ansiblelint.rules import AnsibleLintRule, RulesCollection
@@ -159,6 +160,20 @@ def matchtask(
                     )
         return result
 
+    def matchplay(self, file: Lintable, data: dict[str, Any]) -> list[MatchError]:
+        if file.kind != "playbook":
+            return []
+        if "collections" in data:
+            return [
+                self.create_matcherror(
+                    message="Don't use collections keyword.",
+                    linenumber=data[LINE_NUMBER_KEY],
+                    tag="fqcn[keyword]",
+                    filename=file,
+                )
+            ]
+        return []
+
 
 # testing code to be loaded only with pytest or when executed the rule file
 if "pytest" in sys.modules: