fix(autofmt): preserve indentation of commented-out RSX blocks (#5464)

* test: add failing idempotency tests for commented-out RSX blocks

Two variants of the regression introduced in v0.7.4 (#5257):
- commented_rsx_block: first line keeps indent, rest gets dedented
- commented_rsx_block_nested: entire block gets dedented

See #5463

* fix(autofmt): preserve indentation of commented-out RSX blocks

Trailing comments before `}` in write_rsx_block were indented at
parent level instead of child level. Truncate the tab from
tabbed_line() and bump indent to child level before
apply_line_comments, same approach as write_trailing_body_comments.

Fixes #5463

packages/autofmt/tests/samples/commented_rsx_block.rsx

@@ -0,0 +1,9 @@
+rsx! {
+    div {
+        h2 { "Title" }
+        // div { class: "wrapper",
+        //     p { "A" }
+        //     p { "B" }
+        // }
+    }
+}

packages/autofmt/tests/samples/commented_rsx_block_between.rsx

@@ -0,0 +1,9 @@
+rsx! {
+    div {
+        h1 { "Before" }
+        // div { class: "commented",
+        //     p { "A" }
+        // }
+        h2 { "After" }
+    }
+}

packages/autofmt/tests/samples/commented_rsx_block_deep.rsx

@@ -0,0 +1,12 @@
+rsx! {
+    div {
+        div {
+            div {
+                h2 { "Title" }
+                // div { class: "deep",
+                //     p { "A" }
+                // }
+            }
+        }
+    }
+}

packages/autofmt/tests/samples/commented_rsx_block_nested.rsx

@@ -0,0 +1,13 @@
+rsx! {
+    Component {
+        field: rsx! {
+            div {
+                h2 { "Title" }
+                // div { class: "wrapper",
+                //     // nested comment
+                //     p { "A" }
+                // }
+            }
+        },
+    }
+}

packages/autofmt/tests/samples/commented_rsx_block_only.rsx

@@ -0,0 +1,6 @@
+rsx! {
+    div {
+        // p { "A" }
+        // p { "B" }
+    }
+}