[Bugfix] - codegen to use serviceId

[kai-ion]

Issue #, if available:

Description of changes:
When a service's Smithy sdkId normalizes
to a different name than the C2J filename prefix the
Smithy pagination/waiters codegen fails to match the service or writes files
to the wrong path. Previously this required a manual entry in the map file.

New services will now create files with serviceId matching smithy

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