Magento 2 setup:upgrade fails privilege check on TiDB

## Enhancement
Description:
Magento 2's bin/magento setup:upgrade fails with "Database user does not have enough privileges" on TiDB, despite GRANT ALL PRIVILEGES being applied. Magento's DbSchemaReader queries INFORMATION_SCHEMA.SCHEMA_PRIVILEGES and USER_PRIVILEGES to validate requirements before altering tables.

Environment:

TiDB Version: v8.5.3-serverless

Magento Version: 2.4.8

Steps to Reproduce:

CREATE DATABASE magento;

GRANT ALL PRIVILEGES ON magento.* TO 'magento_user'@'%';

FLUSH PRIVILEGES;

Run php bin/magento setup:upgrade

Actual Result:
Error: Database user does not have enough privileges... (list of 16 privileges).

Request:
Please verify if TiDB’s INFORMATION_SCHEMA returns privilege strings in a format (case/spacing) that differs from MySQL 8.0, causing Magento's regex parser to fail.

Reproduce the failure with TiDB v8.5.3-serverless using the listed GRANT statements, then inspect the INFORMATION_SCHEMA privilege results consumed by Magento's DbSchemaReader. Compare their format with MySQL 8.0 and determine what must change for bin/magento setup:upgrade to pass its privilege check.

Written by the indexing model from the issue text.