feat: add discardableResult to ParseObject methods

[vdkdamian]

New Pull Request Checklist

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

Issue Description

If you want to execute save() or fetch(),... the function returns the ParseObject. If you don't need it you need to cancel it out with an underscore replacement.

Related issue: #384

Approach

@discardableResult adds the possibility to skip the result as developer.
It's up to the developer to decide whether they use the result or not.

TODOs before merging

• Add entry to changelog

[parse-github-assistant]

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[codecov]

Codecov Report

Merging #385 (6a887e3) into main (b0bd351) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #385      +/-   ##
==========================================
- Coverage   89.66%   89.64%   -0.03%     
==========================================
  Files         155      155              
  Lines       14121    14121              
==========================================
- Hits        12662    12659       -3     
- Misses       1459     1462       +3     

Impacted Files	Coverage Δ
...s/ParseSwift/Objects/ParseInstallation+async.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseObject+async.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseUser+async.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Objects/ParseUser.swift	86.12% <0.00%> (-0.18%)	⬇️
Sources/ParseSwift/Objects/ParseObject.swift	85.10% <0.00%> (-0.16%)	⬇️

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[vdkdamian]

@cbaker6 Could you help me point why the tests are failing?
I tried running the tests on my mac, but I am on the Ventura Beta. The tests are failing on something I noticed since the beginning of the Beta's. All function like "saveAll", "fetchAll",... give me a warning. Might be a future problem when Ventura and iOS 16 release.

But I don't think that has anything to do with the little changes I made

[cbaker6]

I wouldn’t worry about the failing tests on your system if they aren’t showing up in the CI. What does show in the CI looks like you didn’t lint the project after your changes. You will need to fix linting before this can be merged.

[vdkdamian]

@cbaker6 I'm testing this line: ParseLiveQueryTests.testEventCreateSubscriptionCallback() and it was successful. I don't get why it fails here. Any ideas?

[cbaker6]

I'm testing this line: ParseLiveQueryTests.testEventCreateSubscriptionCallback() and it was successful. I don't get why it fails here. Any ideas?

This is a random failure that only occurs in the CI so you can ignore.

Can you add @discardableResult to the equivalent methods in ParseInstallation and ParseUser?

[vdkdamian]

Now something is wrong with linux?

[cbaker6]

LGTM