Fix Rust's TimeColumn::new_seconds/new_nanos creating sequence time…

…lines (#7402)

### What

Ran into this bug in the comparison test of an new upcoming snippet.

Considered added dedicated unit testing, but not entirely clear to me
how to go about it without putting in too much effort 🤔 Luckily this
will be in part covered by aforementioned snippet.

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- [PR Build Summary](https://build.rerun.io/pr/7402)
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crates/store/re_chunk/src/chunk.rs

@@ -804,7 +804,7 @@ impl TimeColumn {
 
         Self::new(
             None,
-            Timeline::new_sequence(name.into()),
+            Timeline::new_temporal(name.into()),
             ArrowPrimitiveArray::<i64>::from_vec(time_vec),
         )
     }
@@ -834,7 +834,7 @@ impl TimeColumn {
 
         Self::new(
             None,
-            Timeline::new_sequence(name.into()),
+            Timeline::new_temporal(name.into()),
             ArrowPrimitiveArray::<i64>::from_vec(time_vec),
         )
     }