feat: do not follower scheduling when dry run

[codecov[bot]]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (4200c1b) 31.42% compared to head (ec4b269) 31.44%.

Files	Patch %	Lines
pkg/controllers/sync/controller.go	0.00%	6 Missing :warning:
pkg/controllers/follower/controller.go	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #296 +/- ## ========================================== + Coverage 31.42% 31.44% +0.02% ========================================== Files 123 122 -1 Lines 14343 14346 +3 ========================================== + Hits 4507 4511 +4 + Misses 9423 9421 -2 - Partials 413 414 +1 ``` | [Flag](https://app.codecov.io/gh/kubewharf/kubeadmiral/pull/296/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewharf) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/kubewharf/kubeadmiral/pull/296/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewharf) | `31.44% <46.66%> (+0.02%)` | :arrow_up: | 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=kubewharf#carryforward-flags-in-the-pull-request-comment) to find out more.

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