metrics(ticdc): Fix kafka compress ratio issue (#11313)

[ti-chi-bot]

This is an automated cherry-pick of #11313

What problem does this PR solve?

Issue Number: close #11314

What is changed and how it works?

follow the kafka producer compression ratio definition: https://pkg.go.dev/github.com/IBM/sarama#section-readme

compression ratio = Size of original data / Size of compressed data * 100

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`.

[ti-chi-bot[bot]]

This cherry pick PR is for a release branch and has not yet been approved by triage owners. Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sdojjy

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tiflow/blob/release-7.1/OWNERS)~~ [sdojjy] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdc-integration-mysql-test	d1fc7be0bbdbaa4aceb0329ccf435db49bf5b317	link	true	/test cdc-integration-mysql-test

Full PR test history. Your PR dashboard.

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