MLIBZ-2491: recovering correctly when the delta set is not available

[heyzooi]

Description

Recovering when the delta set is not enabled in the backend

Changes

• Setting FindOperation.deltaSet to false if we detected the delta set feature is not enabled in the backend

Tests

• Unit Test

1. Enable auto-pagination and deltaset in a store and pull
2. Disable deltaset in the backend of an app and create 10 items in the collection
3. Pull with maxSizePerResultSet = 3

Expected result: Pull performs deltaset request that fails because the deltaset is not enabled in the backend and then a regular GET is made using auto-pagination and maxSizePerResultSet

[codecov-io]

Codecov Report

Merging #289 into develop will increase coverage by 0.15%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #289      +/-   ##
===========================================
+ Coverage    89.16%   89.32%   +0.15%     
===========================================
  Files           70       70              
  Lines         8981     8982       +1     
===========================================
+ Hits          8008     8023      +15     
+ Misses         973      959      -14

Flag	Coverage Δ
#Mac	88.52% <100%> (+0.09%)	⬆️
#iOS	88.11% <100%> (+0.07%)	⬆️

Impacted Files	Coverage Δ
Kinvey/Kinvey/FindOperation.swift	96.12% <100%> (+0.36%)	⬆️
Kinvey/Kinvey/FileStore.swift	87.82% <0%> (+0.13%)	⬆️
Kinvey/Kinvey/PushOperation.swift	94% <0%> (+1%)	⬆️
Kinvey/Kinvey/CacheManager.swift	97.22% <0%> (+2.77%)	⬆️
Kinvey/Kinvey/Kinvey.swift	100% <0%> (+3.08%)	⬆️
Kinvey/Kinvey/Operation.swift	83.95% <0%> (+6.17%)	⬆️

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[Martin-Hristov]

LGTM