codec(ticdc): avro decode float by using float32 (#8567)

[ti-chi-bot]

This is an automated cherry-pick of #8567

What problem does this PR solve?

Issue Number: close #8490

What is changed and how it works?

• parse mysql.TypeFloat by using float32

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

Questions

Will it cause performance regression or break compatibility?

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

Release note

Fix avro float type precision by using float32 to parse the data correctly

[ti-chi-bot]

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[ti-chi-bot]

@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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