Enable clippy::nonminimal_bool (#8755)

This PR enables the
[`clippy::nonminimal_bool`](https://rust-lang.github.io/rust-clippy/master/index.html#/nonminimal_bool)
rule and fixes the outstanding violations.

Release Notes:

- N/A

crates/terminal_view/src/terminal_view.rs

@@ -454,7 +454,7 @@ fn subscribe_for_terminal_events(
             Event::TitleChanged => {
                 cx.emit(ItemEvent::UpdateTab);
                 let terminal = this.terminal().read(cx);
-                if !terminal.task().is_some() {
+                if terminal.task().is_none() {
                     if let Some(foreground_info) = &terminal.foreground_process_info {
                         let cwd = foreground_info.cwd.clone();
 
@@ -897,7 +897,7 @@ impl Item for TerminalView {
     }
 
     fn added_to_workspace(&mut self, workspace: &mut Workspace, cx: &mut ViewContext<Self>) {
-        if !self.terminal().read(cx).task().is_some() {
+        if self.terminal().read(cx).task().is_none() {
             cx.background_executor()
                 .spawn(TERMINAL_DB.update_workspace_id(
                     workspace.database_id(),