fix: import machine user with secret

[eliobischof]

Definition of Ready

• [ ] Short description of the feature/issue is added in the pr description
• [ ] PR is linked to the corresponding user story
• [ ] Acceptance criteria are met
• [ ] All open todos and follow ups are defined in a new ticket and justified
• [ ] Deviations from the acceptance criteria and design are agreed with the PO and documented.
• [ ] No debug or dead code
• [ ] My code has no repetitions
• [ ] All non-functional requirements are met
• [ ] The generic lifecycle acceptance test passes for affected resources.
• [ ] Examples are up-to-date and meaningful. The provider version is incremented.
• [ ] Docs are generated.
• [ ] Code is generated where possible.

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

:exclamation: No coverage uploaded for pull request base (generate_machine_secret@6d59646). Click here to learn what that means.

Files	Patch %	Lines
zitadel/machine_user/funcs.go	0.00%	1 Missing and 2 partials :warning:
zitadel/helper/import.go	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## generate_machine_secret #162 +/- ## ========================================================== Coverage ? 63.11% ========================================================== Files ? 159 Lines ? 12881 Branches ? 0 ========================================================== Hits ? 8130 Misses ? 3467 Partials ? 1284 ``` | [Flag](https://app.codecov.io/gh/zitadel/terraform-provider-zitadel/pull/162/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zitadel) | Coverage Δ | | |---|---|---| | [acceptance-tests](https://app.codecov.io/gh/zitadel/terraform-provider-zitadel/pull/162/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zitadel) | `63.11% <0.00%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zitadel#carryforward-flags-in-the-pull-request-comment) to find out more.

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