Improve init templates (get rid of string replacing)

[ansgarm]

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Description

Currently our templates used in cdktf init do a string replace to inject a RemoteBackend. This is less than ideal and broke in more than one instance (see here for one fix). We should make that more robust.

References

• https://github.com/hashicorp/terraform-cdk/issues/1493
• https://github.com/hashicorp/terraform-cdk/issues/1494