codec(cdc) Removing logging of message bodies to avoid PII issues (#9032)

[ti-chi-bot]

This is an automated cherry-pick of #9032

What problem does this PR solve?

Issue is described here #9031

Issue Number: close #9031

What is changed and how it works?

We simply print the length of the value instead of its contents

Check List

make test succeeded

Tests

• Unit test

Questions

Will it cause performance regression or break compatibility? No

Do you need to update user documentation, design documentation or monitoring documentation? No

Release note

None.

[ti-chi-bot]

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[ti-chi-bot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[ti-chi-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
jenkins-ticdc/verify	500408a	link	true	/test verify

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[ti-chi-bot]

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

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AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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