MDEV-31608 - Connector/NET fails to connect since 10.10

Connector/NET does not expect collation IDs returned by "show collations"
to be NULL, runs into an exception.

The fix is to determine connector/net using its connection attributes,
then make sure "show collations" does not output NULL IDs.

The patch introduces new old_mode NO_NULL_COLLATION_IDs, that is
automatically set, once MySQL Connector/NET connection is determined.

A test was added, that uses MySql.Data from powershell - only works
if MySql.Data is installed into GAC (i.e with C/NET MSI package)

mysql-test/main/mysqld--help,win.rdiff

@@ -1,4 +1,6 @@
-@@ -180,6 +180,7 @@
+--- main/mysqld--help.result	2023-11-30 02:21:51.951132200 +0100
++++ main/mysqld--help,win.reject	2023-11-30 02:35:44.404612300 +0100
+@@ -191,6 +191,7 @@
   --console           Write error output on screen; don't remove the console
   window on windows.
   --core-file         Write core on crashes
@@ -6,7 +8,7 @@
   -h, --datadir=name  Path to the database root directory
   --date-format=name  The DATE format (ignored)
   --datetime-format=name 
-@@ -650,6 +651,7 @@
+@@ -696,6 +697,7 @@
   Use MySQL-5.6 (instead of MariaDB-5.3) format for TIME,
   DATETIME, TIMESTAMP columns.
   (Defaults to on; use --skip-mysql56-temporal-format to disable.)
@@ -14,7 +16,7 @@
   --net-buffer-length=# 
   Buffer length for TCP/IP and socket communication
   --net-read-timeout=# 
-@@ -1327,6 +1328,10 @@
+@@ -1351,6 +1353,10 @@
   Alias for log_slow_query_file. Log slow queries to given
   log file. Defaults logging to 'hostname'-slow.log. Must
   be enabled to activate other slow log options
@@ -25,7 +27,7 @@
   --socket=name       Socket file to use for connection
   --sort-buffer-size=# 
   Each thread that needs to do a sort allocates a buffer of
-@@ -1351,6 +1356,7 @@
+@@ -1376,6 +1382,7 @@
   deleting or updating every row in a table.
   --stack-trace       Print a symbolic stack trace on failure
   (Defaults to on; use --skip-stack-trace to disable.)
@@ -33,7 +35,7 @@
   --standard-compliant-cte 
   Allow only CTEs compliant to SQL standard
   (Defaults to on; use --skip-standard-compliant-cte to disable.)
-@@ -1426,6 +1432,11 @@
+@@ -1454,6 +1461,11 @@
   --thread-pool-max-threads=# 
   Maximum allowed number of worker threads in the thread
   pool
@@ -45,7 +47,7 @@
   --thread-pool-oversubscribe=# 
   How many additional active worker threads in a group are
   allowed.
-@@ -1464,8 +1475,8 @@
+@@ -1493,8 +1505,8 @@
   automatically convert it to an on-disk MyISAM or Aria
   table.
   -t, --tmpdir=name   Path for temporary files. Several paths may be specified,
@@ -56,7 +58,7 @@
   --transaction-alloc-block-size=# 
   Allocation block size for transactions to be stored in
   binary log
-@@ -1685,6 +1696,7 @@
+@@ -1716,6 +1728,7 @@
  myisam-stats-method NULLS_UNEQUAL
  myisam-use-mmap FALSE
  mysql56-temporal-format TRUE
@@ -64,7 +66,7 @@
  net-buffer-length 16384
  net-read-timeout 30
  net-retry-count 10
-@@ -1841,6 +1853,7 @@
+@@ -1874,6 +1887,7 @@
  slave-type-conversions 
  slow-launch-time 2
  slow-query-log FALSE
@@ -72,7 +74,7 @@
  sort-buffer-size 2097152
  sql-mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
  sql-safe-updates FALSE
-@@ -1867,6 +1880,8 @@
+@@ -1901,6 +1915,8 @@
  thread-pool-exact-stats FALSE
  thread-pool-idle-timeout 60
  thread-pool-max-threads 65536