[DevSetting] Add CincVersion override to version during imagebuilder

[himani2411]

Description of changes

Mirrors the existing CincInstaller override pattern so customers can pin or upgrade the CINC client version baked into their AMIs at pcluster build-image time without forking the resource template.

NOTE: The Overriding Cinc version needs to be available in Official ParallelCluster S3 Bucket if CX do not use CincInstaller override. In order to Override cinc version from omnitruck we needs to use CincInstaller to install the overriding version from internet.

Tests

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