fix: saving ParseFiles locally do not throw error

[cbaker6]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

Attempting to fetch or save a file locally that has a directory e.g. test/file.svg causes the Swift SDK to throw an error on the client because it attempts to create the directory structure in the filename instead of just taking the filename.

Note: This does not fix the issue of saving ParseFiles with directories in their names to the server as that issue appears to be server-side and not interpreting strict JSON.

Related issue: #n/a

Approach

Only use the file name when saving ParseFile's locally and ignore the directories as they are unnecessary.

TODOs before merging

• Add tests
• Reduce flakiness of LiveQuery tests by skipping some tests dynamically whenever they don't mock as connected to a live query server. When mocking connected is successful, run the full test. Whenever a test is skipped it will show in the logs
• Add entry to changelog

[parse-github-assistant]

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[codecov]

Codecov Report

Merging #399 (ce1a321) into main (df71568) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #399   +/-   ##
=======================================
  Coverage   89.62%   89.63%           
=======================================
  Files         158      158           
  Lines       15080    15081    +1     
=======================================
+ Hits        13516    13518    +2     
+ Misses       1564     1563    -1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/ParseFile.swift	87.54% <ø> (ø)
Sources/ParseSwift/API/API+Command.swift	89.40% <100.00%> (+0.02%)	⬆️
Sources/ParseSwift/Objects/ParseObject.swift	87.29% <0.00%> (+0.14%)	⬆️

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