fix: cdk synth is unable to find docker binary for bundling assets when using Macos

[damshenas]

Issue # (if applicable)

Closes #30570 .

Reason for this change
In some MacOs the path to Docker binary is not resolvable for CDK. Hence the need for pointing directly to docker binary which should be the same for all docker installations in Mac (if not should be resolved by existing measures)

Description of changes
Added a function getDockerCmdMac() and used in the existing getDockerCmd().

Description of how you validated changes
No unit tests are added due to missing of test environment (that being a macos with docker desktop installed)

Checklist

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 7a90f9a
• Result: FAILED
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