support the resubmission of workflows with finetuning

[wanghan-iapcm]

• skip the init model training in the first iteration (iter0) if we do finetuning.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (0c7aac7) 88.11% compared to head (7dffdbf) 88.13%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #165 +/- ## ========================================== + Coverage 88.11% 88.13% +0.02% ========================================== Files 80 80 Lines 4022 4021 -1 ========================================== Hits 3544 3544 + Misses 478 477 -1 ``` | [Files](https://app.codecov.io/gh/deepmodeling/dpgen2/pull/165?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling) | Coverage Δ | | |---|---|---| | [dpgen2/entrypoint/submit.py](https://app.codecov.io/gh/deepmodeling/dpgen2/pull/165?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2VudHJ5cG9pbnQvc3VibWl0LnB5) | `68.95% <ø> (+0.24%)` | :arrow_up: | | [dpgen2/op/run\_dp\_train.py](https://app.codecov.io/gh/deepmodeling/dpgen2/pull/165?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL29wL3J1bl9kcF90cmFpbi5weQ==) | `98.41% <100.00%> (ø)` | | | [dpgen2/utils/dflow\_query.py](https://app.codecov.io/gh/deepmodeling/dpgen2/pull/165?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL3V0aWxzL2RmbG93X3F1ZXJ5LnB5) | `82.00% <100.00%> (ø)` | |

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