Fix code action formatters creating separate transaction (#26311)

Closes #24588
Closes #25419

Restructures `LspStore.format_local` a decent bit in order to make how
the transaction history is preserved more clear, and in doing so fix
various bugs with how the transaction history is handled during a format
request (especially when formatting in remote dev)

Release Notes:

- Fixed an issue that prevented formatting from working when working
with remote dev
- Fixed an issue when using code actions as a format step where the
edits made by the code actions would not be grouped with the other
format edits in the undo history

crates/project/src/prettier_store.rs

@@ -704,7 +704,7 @@ pub(super) async fn format_with_prettier(
     prettier_store: &WeakEntity<PrettierStore>,
     buffer: &Entity<Buffer>,
     cx: &mut AsyncApp,
-) -> Option<Result<crate::lsp_store::FormatOperation>> {
+) -> Option<Result<language::Diff>> {
     let prettier_instance = prettier_store
         .update(cx, |prettier_store, cx| {
             prettier_store.prettier_instance_for_buffer(buffer, cx)
@@ -738,7 +738,6 @@ pub(super) async fn format_with_prettier(
             let format_result = prettier
                 .format(buffer, buffer_path, ignore_dir, cx)
                 .await
-                .map(crate::lsp_store::FormatOperation::Prettier)
                 .with_context(|| format!("{} failed to format buffer", prettier_description));
 
             Some(format_result)