fix(datastore): Ignore ApiAuthExceptions when subscribing or syncing models

[mattcreaser]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:
#2399

Description of changes:

• Api category emits an ApiAuthException from MultiAuthSubscriptionOperation if authTypes are exhausted when trying to establish a subscription (this is already how the multi-auth sync worked, and appeared to be the intended implementation based on existing code comments).
• Datastore ignores ApiAuthException encountered when starting the SubscriptionProcessor and the SyncProcessor. This effectively skips those models and allows syncing/subscribing to continue for other models.

How did you test these changes?

• Used schema from issue and verified that DataStore starts normally after fix.

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #2561 (d53948f) into main (e6c2aa1) will increase coverage by 0.26%.
The diff coverage is 60.00%.

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@@            Coverage Diff             @@
##             main    #2561      +/-   ##
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+ Coverage   41.16%   41.43%   +0.26%     
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  Files         874      874              
  Lines       27635    27644       +9     
  Branches     3880     3883       +3     
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+ Hits        11375    11453      +78     
+ Misses      15039    14962      -77     
- Partials     1221     1229       +8     

[ankpshah]

This PR fixes #1394 as well