Implement auto-upload mode, remove ACPWorkflow

[greschd]

• currently external_path is always relative to the server working directory, is this ok?
• how should we deal with the case where server and Python have different CWD with a local server?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 54.12844% with 50 lines in your changes missing coverage. Please review.

Project coverage is 90.89%. Comparing base (19f59d5) to head (10b3737).

Files with missing lines	Patch %	Lines
src/ansys/acp/core/extras/example_helpers.py	7.14%	26 Missing :warning:
src/ansys/acp/core/_tree_objects/model.py	52.63%	9 Missing :warning:
...nsys/acp/core/_tree_objects/_solid_model_export.py	0.00%	6 Missing :warning:
src/ansys/acp/core/_server/acp_instance.py	88.88%	3 Missing :warning:
src/ansys/acp/core/_tree_objects/base.py	83.33%	3 Missing :warning:
src/ansys/acp/core/_server/launch.py	60.00%	2 Missing :warning:
...sys/acp/core/_tree_objects/imported_solid_model.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #694 +/- ## ========================================== - Coverage 94.56% 90.89% -3.67% ========================================== Files 108 108 Lines 5738 5702 -36 ========================================== - Hits 5426 5183 -243 - Misses 312 519 +207 ``` | [Flag](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | Coverage Δ | | |---|---|---| | [minimum-deps](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `?` | | | [python-3.10](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `?` | | | [python-3.11](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `?` | | | [python-3.12](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `90.89% <54.12%> (-3.60%)` | :arrow_down: | | [server-2024R2](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `90.89% <54.12%> (-0.11%)` | :arrow_down: | | [server-2025R1](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `?` | | | [server-2025R2](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `?` | | | [server-latest](https://app.codecov.io/gh/ansys/pyacp/pull/694/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansys) | `?` | | 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=ansys#carryforward-flags-in-the-pull-request-comment) to find out more.

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