fix(aws-lambda): Fix the log format type on logging configurations

[AnuragMohapatra]

Updated the logFormat property type from string to LogFormat

Closes #28114 .

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[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[AnuragMohapatra]

There is already a PR #28127

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Fixes must contain a change to an integration test file and the resulting snapshot.
❌ The title of the pull request should omit 'aws-' from the name of modified packages. Use 'lambda' instead of 'aws-lambda'.

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