Set correct OTel Span name for transaction commits

[fibbers]

When collecting tracing information via OpenTelemetry, I saw unexpected Rollback spans which I couldn't explain.
Following the source, it seems it should have indeed been a Commit span, so correct that in this PR.

I'm using:

<dependency>
	<groupId>com.mysql</groupId>
	<artifactId>mysql-connector-j</artifactId>
	<version>8.4.0</version>
</dependency>

Notes:

• I just signed the OCA, I believe it's under review currently
• I tried searching for tests, but couldn't find any, so I hope my PR is complete this way
• this PR only addresses the version I use (8.4.0), I hope it can be cherry-picked to other releases as well if necessary

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at https://oca.opensource.oracle.com/
Please make sure to include your MySQL bug system user (email) in the returned form.
Thanks

[fibbers]

Hi, the OCA was just approved. I linked my GitHub username in there, so I hope everything's correct now.

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
"I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it."
Thanks

[fibbers]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=115845 for updates.
Thanks