fix(postgres) regression (#21466)

### What does this PR do?
Fix: https://github.com/oven-sh/bun/issues/21351

Relevant changes:
Fix advance to properly cleanup success and failed queries that could be
still be in the queue
Always ref before executing
Use stronger atomics for ref/deref and hasPendingActivity
Fallback when thisValue is freed/null/zero and check if vm is being
shutdown
The bug in --hot in `resolveRopeIfNeeded` Issue is not meant to be fixed
in this PR this is a fix for the postgres regression
Added assertions so this bug is easier to catch on CI
### How did you verify your code works?
Test added

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/sql/postgres/protocol/NewReader.zig

@@ -57,10 +57,14 @@ pub fn NewReaderWrap(
         pub fn int(this: @This(), comptime Int: type) !Int {
             var data = try this.read(@sizeOf((Int)));
             defer data.deinit();
-            if (comptime Int == u8) {
-                return @as(Int, data.slice()[0]);
+            const slice = data.slice();
+            if (slice.len < @sizeOf(Int)) {
+                return error.ShortRead;
             }
-            return @byteSwap(@as(Int, @bitCast(data.slice()[0..@sizeOf(Int)].*)));
+            if (comptime Int == u8) {
+                return @as(Int, slice[0]);
+            }
+            return @byteSwap(@as(Int, @bitCast(slice[0..@sizeOf(Int)].*)));
         }
 
         pub fn peekInt(this: @This(), comptime Int: type) ?Int {