[Task] Add account expiry monitoring metrics for SQL Server

[turanalmammadov]

Related: #3737

What's Changed?

Added password expiry monitoring for SQL Server login accounts.

New Metric: account_expiry

Field	Type	Description
name	string	SQL Server login name
type	string	Login type (SQL/Windows/Group/etc.)
is_disabled	number	Whether the account is disabled
password_expiry_date	string	Expiration date
days_until_expiry	number	Days remaining (DATEDIFF)

SQL Query

SELECT name, 
  CASE WHEN type_desc = 'SQL_LOGIN' THEN 'SQL Login' ... END as type,
  is_disabled, password_expiry_date,
  DATEDIFF(day, GETDATE(), password_expiry_date) as days_until_expiry
FROM sys.sql_logins 
WHERE is_disabled = 0 
ORDER BY password_expiry_date ASC;

Task List Progress (from #3737)

• app-mariadb.yml (PR [Task] Add database account expiry monitoring metrics for MariaDB #4032)
• app-mongodb.yml (PR [Task] Add user account monitoring metrics for MongoDB #4033)
• app-sqlserver.yml (this PR)

Signed-off-by: Turan Almammadov 16321061+turanalmammadov@users.noreply.github.com

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