[MOB-4786] split out mocks

[roninopf]

🔹 Jira Ticket(s)

• MOB-4786

✏️ Description

• splits out the various classes/structs in CommonMocks.swift into their own files
• this is purely a refactor, so there should be 0 functional changes in the SDK or the tests

[codecov[bot]]

Codecov Report

Merging #574 (158f8c6) into jay/MOB-4754-last-push-payload (69960f0) will decrease coverage by 0.06%. The diff coverage is n/a.

@@                        Coverage Diff                         @@
##           jay/MOB-4754-last-push-payload     #574      +/-   ##
==================================================================
- Coverage                           85.45%   85.38%   -0.07%     
==================================================================
  Files                                  91       91              
  Lines                                6282     6282              
==================================================================
- Hits                                 5368     5364       -4     
- Misses                                914      918       +4     

Impacted Files	Coverage Δ
swift-sdk/Internal/IterableTaskRunner.swift	89.41% <0.00%> (-2.12%)	:arrow_down:

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