Only check `process_class` for calcfunction and workfunction

[superstar54]

Note: WorkChain and CalcJob do not have process_class

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.99%. Comparing base (5937b88) to head (495927f). Report is 43 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #258 +/- ## ========================================== + Coverage 75.75% 79.99% +4.24% ========================================== Files 70 65 -5 Lines 4615 4864 +249 ========================================== + Hits 3496 3891 +395 + Misses 1119 973 -146 ``` | [Flag](https://app.codecov.io/gh/aiidateam/aiida-workgraph/pull/258/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidateam) | Coverage Δ | | |---|---|---| | [python-3.11](https://app.codecov.io/gh/aiidateam/aiida-workgraph/pull/258/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidateam) | `79.91% <100.00%> (+4.24%)` | :arrow_up: | | [python-3.12](https://app.codecov.io/gh/aiidateam/aiida-workgraph/pull/258/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidateam) | `79.91% <100.00%> (?)` | | | [python-3.9](https://app.codecov.io/gh/aiidateam/aiida-workgraph/pull/258/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidateam) | `79.95% <100.00%> (+4.21%)` | :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=aiidateam#carryforward-flags-in-the-pull-request-comment) to find out more.

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