…`frontend/src/app/common` (apache#4358)

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### What changes were proposed in this PR?
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(For readability, `...` refers to `frontend/src/app` in the codebase.)

This PR moves shared computing unit types and services to `.../common`
under `frontend/src/app`. Specifically:
| Original location | New location | 
| ---------------- | ------------- |
| `.../dashboard/service/user/computing-unit-actions` |
`.../common/service/computing-unit/computing-unit-actions` |
| `.../workspace/service/workflow-computing-unit` |
`.../common/service/computing-unit/computing-unit-managing` |
| `.../workspace/service/computing-unit-status` |
`.../common/service/computing-unit/computing-unit-status` |
| `.../workspace/types/computing-unit-connection.interface.ts` |
`.../common/type/computing-unit-connection.interface.ts` |
| `.../workspace/types/workflow-computing-unit.ts` |
`.../common/type/workflow-computing-unit.ts` |

### Any related issues, documentation, discussions?
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Closes apache#4362 

### How was this PR tested?
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Locally tested

### Was this PR authored or co-authored using generative AI tooling?
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No

---------

Co-authored-by: Chen Li <chenli@gmail.com>
Co-authored-by: Kunwoo (Chris) <143021053+kunwp1@users.noreply.github.com>
Co-authored-by: Jiadong Bai <43344272+bobbai00@users.noreply.github.com>