Add schema to source data in SOAP pipeline

[camposandro]

Adds the arrow schema as an argument to the parquet reading of the source data files in the SOAP pipeline, which I missed in https://github.com/astronomy-commons/hipscat-import/pull/348. It also fixes the documentation build, which is failing, by installing hipscat from source.

• [ ] My PR includes a link to the issue that I am addressing

Code Quality

• [X] I have read the Contribution Guide and LINCC Frameworks Code of Conduct
• [X] My code follows the code style of this project
• [X] My code builds (or compiles) cleanly without any errors or warnings
• [X] My code contains relevant comments and necessary documentation

[codecov[bot]]

Codecov Report

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

Project coverage is 99.72%. Comparing base (aac8b9b) to head (766c767).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #360 +/- ## ======================================= Coverage 99.72% 99.72% ======================================= Files 26 26 Lines 1454 1454 ======================================= Hits 1450 1450 Misses 4 4 ```

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