* Refactored channel saving logic
The code for saving channels has been refactored handling different database drivers. The query string is now dynamically generated based on the driver in use. Additionally, error handling has been improved to account for cases where no rows are affected by the insert operation. Because a conflict should be detected due to the complex flow under the call of the function.
* Refactor variable name and error handling in channel store
The variable 'q' has been renamed to 'insert' for better readability. Error handling after executing the insert statement has been improved by checking for errors immediately after execution, rather than waiting until rows affected are checked. This provides a more immediate response to potential issues during the insert operation.
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Co-authored-by: Mattermost Build <build@mattermost.com>
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