fix: typesVersions not respecting outDir from tsconfig file

[mrgrain]

Fixes #1234

Also fixes an issue related the .type-compat output path that was discovered when adding tests. When getting outdir from the program, this might be either a relative or absolute path. Previously the code assumed it was always relative which is not correct. This led to absolute paths being used for the .type-compat dir and in the post processing; ultimately leading to a compilation failure. The fix is to ensure outdir & .type-compat are normalized to a relative path.

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[aws-cdk-automation]

💚 All backports created successfully

Status	Branch	Result
✅	maintenance/v5.3

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