Fix inconsistencies between MSC3952 and implementation. (#14957)

* Correct the push rule IDs.
* Removes the sound tweak for room notifications.

changelog.d/14957.feature

+Experimental support for [MSC3952](https://github.com/matrix-org/matrix-spec-proposals/pull/3952): intentional mentions.

rust/src/push/base_rules.rs

@@ -132,7 +132,7 @@ pub const BASE_APPEND_OVERRIDE_RULES: &[PushRule] = &[
         default_enabled: true,
     },
     PushRule {
-        rule_id: Cow::Borrowed(".org.matrix.msc3952.is_user_mentioned"),
+        rule_id: Cow::Borrowed(".org.matrix.msc3952.is_user_mention"),
         priority_class: 5,
         conditions: Cow::Borrowed(&[Condition::Known(KnownCondition::IsUserMention)]),
         actions: Cow::Borrowed(&[Action::Notify, HIGHLIGHT_ACTION, SOUND_ACTION]),
@@ -148,7 +148,7 @@ pub const BASE_APPEND_OVERRIDE_RULES: &[PushRule] = &[
         default_enabled: true,
     },
     PushRule {
-        rule_id: Cow::Borrowed(".org.matrix.msc3952.is_room_mentioned"),
+        rule_id: Cow::Borrowed(".org.matrix.msc3952.is_room_mention"),
         priority_class: 5,
         conditions: Cow::Borrowed(&[
             Condition::Known(KnownCondition::IsRoomMention),
@@ -156,7 +156,7 @@ pub const BASE_APPEND_OVERRIDE_RULES: &[PushRule] = &[
                 key: Cow::Borrowed("room"),
             }),
         ]),
-        actions: Cow::Borrowed(&[Action::Notify, HIGHLIGHT_ACTION, SOUND_ACTION]),
+        actions: Cow::Borrowed(&[Action::Notify, HIGHLIGHT_ACTION]),
         default: true,
         default_enabled: true,
     },