Is your feature request related to a problem? Please describe.
Even though pushing the whole secret is generically documented as supported for the PushSecret resource here, it is still up to the provider to support and proper implement it, talking specifically about the GCSM provider, that provider is not yet supporting this feature and if you try to create a PushSecret object by leaving off the secret key and remote property options, the controller will fail with a generic pushing the whole secret is not yet implemented error.

Describe the solution you'd like
I would like to use the PushSecret object, as described in the "Pushing the whole secret" documentation, when pushing the whole secret to Hashicorp Vault.

Describe alternatives you've considered
For now it only works if I whitelist all the secret keys I want to push, but for larger secrets, that is too much work and won't scale.