[yugabyte#24979] YSQL: Set pthread_attr_setstacksize to 512 KB in ysql connection manager

Summary:
Set pthread_attr_setstacksize to 512 KB in ysql connection manager. This is to fix crashes involving Alma 9 machines.
```
#0  0x000055e430191fd7 in tcmalloc::tcmalloc_internal::PageTracker::Get(tcmalloc::tcmalloc_internal::Length) ()
#1  0x000055e430192774 in tcmalloc::tcmalloc_internal::HugePageFiller<tcmalloc::tcmalloc_internal::PageTracker>::TryGet(tcmalloc::tcmalloc_internal::Length, unsigned long)
    ()
#2  0x000055e430160b3a in tcmalloc::tcmalloc_internal::HugePageAwareAllocator::New(tcmalloc::tcmalloc_internal::Length, unsigned long) ()
#3  0x000055e4301437a2 in void* tcmalloc::tcmalloc_internal::SampleifyAllocation<tcmalloc::tcmalloc_internal::Static, tcmalloc::tcmalloc_internal::TCMallocPolicy<tcmalloc::tcmalloc_internal::MallocOomPolicy, tcmalloc::tcmalloc_internal::MallocAlignPolicy, tcmalloc::tcmalloc_internal::AllocationAccessHotPolicy, tcmalloc::tcmalloc_internal::InvokeHooksPolicy, tcmalloc::tcmalloc_internal::LocalNumaPartitionPolicy> >(tcmalloc::tcmalloc_internal::Static&, tcmalloc::tcmalloc_internal::TCMallocPolicy<tcmalloc::tcmalloc_internal::MallocOomPolicy, tcmalloc::tcmalloc_internal::MallocAlignPolicy, tcmalloc::tcmalloc_internal::AllocationAccessHotPolicy, tcmalloc::tcmalloc_internal::InvokeHooksPolicy, tcmalloc::tcmalloc_internal::LocalNumaPartitionPolicy>, unsigned long, unsigned long, unsigned long, void*, tcmalloc::tcmalloc_internal::Span*, unsigned long*) ()
#4  0x000055e43014339b in void* slow_alloc<tcmalloc::tcmalloc_internal::TCMallocPolicy<tcmalloc::tcmalloc_internal::MallocOomPolicy, tcmalloc::tcmalloc_internal::MallocAlignPolicy, tcmalloc::tcmalloc_internal::AllocationAccessHotPolicy, tcmalloc::tcmalloc_internal::InvokeHooksPolicy, tcmalloc::tcmalloc_internal::LocalNumaPartitionPolicy>, decltype(nullptr)>(tcmalloc::tcmalloc_internal::TCMallocPolicy<tcmalloc::tcmalloc_internal::MallocOomPolicy, tcmalloc::tcmalloc_internal::MallocAlignPolicy, tcmalloc::tcmalloc_internal::AllocationAccessHotPolicy, tcmalloc::tcmalloc_internal::InvokeHooksPolicy, tcmalloc::tcmalloc_internal::LocalNumaPartitionPolicy>, unsigned long, decltype(nullptr))
    ()
#5  0x000055e4301404e6 in malloc ()
#6  0x00007fc3a67b1d7e in ssl3_setup_write_buffer () from /home/centos/code/local_testing/conn_manager_ssl_auth/yugabyte-b124/bin/../lib/yb-thirdparty/libssl.so.3
#7  0x00007fc3a67ae824 in do_ssl3_write () from /home/centos/code/local_testing/conn_manager_ssl_auth/yugabyte-b124/bin/../lib/yb-thirdparty/libssl.so.3
#8  0x00007fc3a67ae3e1 in ssl3_write_bytes () from /home/centos/code/local_testing/conn_manager_ssl_auth/yugabyte-b124/bin/../lib/yb-thirdparty/libssl.so.3
#9  0x00007fc3a67cc251 in ssl3_do_write () from /home/centos/code/local_testing/conn_manager_ssl_auth/yugabyte-b124/bin/../lib/yb-thirdparty/libssl.so.3
#10 0x00007fc3a67c1a6a in state_machine () from /home/centos/code/local_testing/conn_manager_ssl_auth/yugabyte-b124/bin/../lib/yb-thirdparty/libssl.so.3
#11 0x000055e43013d303 in mm_tls_handshake_cb (handle=<optimized out>) at ../../src/odyssey/third_party/machinarium/sources/tls.c:453
yugabyte#12 0x000055e43013b9e7 in mm_epoll_step (poll=0x37beffd71a60, timeout=<optimized out>) at ../../src/odyssey/third_party/machinarium/sources/epoll.c:79
yugabyte#13 0x000055e43013b386 in mm_loop_step (loop=0x37beffd72980) at ../../src/odyssey/third_party/machinarium/sources/loop.c:64
yugabyte#14 machine_main (arg=0x37beffd72780) at ../../src/odyssey/third_party/machinarium/sources/machine.c:56
yugabyte#15 0x00007fc3a5e89c02 in start_thread (arg=<optimized out>) at pthread_create.c:443
yugabyte#16 0x00007fc3a5f0ec40 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81```
Note that, this 512 KB value is the same as the value used in tserver and master processes via the min_thread_stack_size_bytes GFlag introduced in https://phorge.dev.yugabyte.com/D38053.
Jira: DB-13388

Test Plan: Jenkins: enable connection manager, all tests

Reviewers: skumar, stiwary

Reviewed By: stiwary

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D40087

Author: Manav Kumar

src/odyssey/third_party/machinarium/sources/machine.c

@@ -8,6 +8,9 @@
 #include <machinarium.h>
 #include <machinarium_private.h>
 
+// Note YB: By default min_thread_stack_size_bytes in YB is set to 512KB.
+#define YB_MIN_THREAD_STACK_BYTES 512 * 1024
+
 __thread mm_machine_t *mm_self = NULL;
 
 static int mm_idle_cb(mm_idle_t *handle)
@@ -119,7 +122,7 @@ MACHINE_API int64_t machine_create(char *name, machine_coroutine_t function,
 		return -1;
 	}
 	mm_machinemgr_add(&machinarium.machine_mgr, machine);
-	rc = mm_thread_create(&machine->thread, PTHREAD_STACK_MIN, machine_main,
+	rc = mm_thread_create(&machine->thread, YB_MIN_THREAD_STACK_BYTES, machine_main,
 			      machine);
 	if (rc == -1) {
 		mm_machinemgr_delete(&machinarium.machine_mgr, machine);