fix: SDK does not properly wait for initialization

[cbaker6]

New Pull Request Checklist

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

Issue Description

Approach

TODOs before merging

• Add tests
• Add entry to changelog
• Add changes to documentation (guides, repository pages, in-code descriptions)

[codecov]

Codecov Report

Attention: Patch coverage is 37.93103% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 91.73%. Comparing base (702ca34) to head (0dc105e).

Files	Patch %	Lines
Sources/ParseSwift/Objects/ParseInstallation.swift	35.71%	9 Missing ⚠️
Sources/ParseSwift/Objects/ParseUser.swift	35.71%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   91.79%   91.73%   -0.06%     
==========================================
  Files         178      178              
  Lines       15802    15830      +28     
==========================================
+ Hits        14505    14522      +17     
- Misses       1297     1308      +11     

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