Do not crash on copy if the source path is missing

[ademariag]

Describe the bug/feature
At the moment, when using the following inventory configuration:

 kapitan:
    compile:
      - input_type: copy
        input_paths:
          - resources/state/${target_name}/.terraform.lock.hcl
        output_path: terraform/

kapitan crashes if the input path is not found.

To Reproduce
Steps to reproduce the behavior:

1. configure copy input as above
2. run kapitan compile
3. See error

Compile error: resources/state/<target_name>/.terraform.lock.hcl for target: <target name> not found in search_paths: ['/src', '/src/lib', '/tmp/tmpemllevg1.kapitan']

Expected behavior
Allow for option to ignore the error

[github-actions]

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