add support for port tx err monitor tables

[Natgerbi]

Why I did it

Define the config_db and state_db table names for the new port TX error monitoring feature, so that orchagent and other consumers can reference them via standard schema constants.

Work item tracking

• Microsoft ADO (number only):

How I did it

• Added CFG_PORT_TX_ERR_MONITOR_TABLE_NAME ("PORT_TX_ERR_MONITOR") to common/schema.h for the config_db table
• Added STATE_PORT_TX_ERR_MONITOR_TABLE_NAME ("PORT_TX_ERR_MONITOR_TABLE") to common/schema.h for the state_db table

How to verify it

• Build sonic-swss-common successfully
• Verify downstream consumers (sonic-swss orchagent) can compile against the new table name macros

Which release branch to backport (provide reason below if selected)

• 202305
• 202311
• 202405
• 202411
• 202505
• 202511

Tested branch (Please provide the tested image version)

Description for the changelog

Add schema definitions for PORT_TX_ERR_MONITOR config and state tables.

Link to config_db schema for YANG module changes

N/A

A picture of a cute animal (not mandatory but encouraged)