test(bottom-most-compaction): wal apply order (#8163)

A follow-up on #8103.
Previously, main branch fails with:

```
assertion `left == right` failed
  left: b"value 3@0x10@0x30@0x28@0x40"
 right: b"value 3@0x10@0x28@0x30@0x40"
```

This gets fixed after #8103 gets merged.


Signed-off-by: Alex Chi Z <chi@neon.tech>

pageserver/src/tenant.rs

@@ -7069,6 +7069,16 @@ mod tests {
                 Lsn(0x30),
                 Value::WalRecord(NeonWalRecord::wal_append("@0x30")),
             ),
+            (
+                get_key(3),
+                Lsn(0x28),
+                Value::WalRecord(NeonWalRecord::wal_append("@0x28")),
+            ),
+            (
+                get_key(3),
+                Lsn(0x30),
+                Value::WalRecord(NeonWalRecord::wal_append("@0x30")),
+            ),
             (
                 get_key(3),
                 Lsn(0x40),
@@ -7128,7 +7138,7 @@ mod tests {
             Bytes::from_static(b"value 0@0x10"),
             Bytes::from_static(b"value 1@0x10@0x20"),
             Bytes::from_static(b"value 2@0x10@0x30"),
-            Bytes::from_static(b"value 3@0x10@0x40"),
+            Bytes::from_static(b"value 3@0x10@0x28@0x30@0x40"),
             Bytes::from_static(b"value 4@0x10"),
             Bytes::from_static(b"value 5@0x10@0x20"),
             Bytes::from_static(b"value 6@0x10@0x20"),
@@ -7141,7 +7151,7 @@ mod tests {
             Bytes::from_static(b"value 0@0x10"),
             Bytes::from_static(b"value 1@0x10@0x20"),
             Bytes::from_static(b"value 2@0x10@0x30"),
-            Bytes::from_static(b"value 3@0x10"),
+            Bytes::from_static(b"value 3@0x10@0x28@0x30"),
             Bytes::from_static(b"value 4@0x10"),
             Bytes::from_static(b"value 5@0x10@0x20"),
             Bytes::from_static(b"value 6@0x10@0x20"),