INTENG-19264 and INTENG-19577 bug fixes

[echo-branch]

Reference

INTENG-19264 and INTENG-19577 Although the two issues are not the same, they are in related area of code and therefore handled in a single fix PR.

Summary

Motivation

INTENG-19264 On cold link open, there are two iOS lifecycle events in a very small window of time. Our existing code improperly attempts to reconcile the two events, with a potential loss of link data. The frequency of failure depends on how much time is elapsed between the first and second lifecycle calls, a ~0.15s delay repros about 1/10 on our test app. Shorter and longer delays did not repro the issue.

Initial fix is to no longer attempt to reconcile the two close lifecycle events. This means all clients will see two callbacks on cold link open. The first is for the app initialization which will contain no link data, the second is for link data arrival.

INTENG-19577 Disable tracking resets SDK state and erases data. Our existing code did not queue the reset requests, so repeated rapid calls to this API could cause a hang. SDK reset and erase data requests are now queued.

Type Of Change

• [x] Bug fix (non-breaking change which fixes an issue) - tracking disabled part of the fix does not impact existing behavior
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected) - cold link open will callback twice, once for each iOS lifecycle event the SDK receives. We previously tried to merge lifecycle events that arrive rapidly. Clients that ignore payloads with no link data are likely not impacted by the change, but those that take action in all cases may need to update code.
• [x] This change requires a documentation update - we will want to make clients aware that cold link open will now callback on cold link open more frequently

Testing Instructions

Scheduled testing session

cc @BranchMetrics/saas-sdk-devs for visibility.

[codecov[bot]]

Codecov Report

Attention: 36 lines in your changes are missing coverage. Please review.

Comparison is base (c7f50be) 51.02% compared to head (e561653) 51.27%. Report is 1 commits behind head on master.

Files	Patch %	Lines
Sources/BranchSDK/Branch.m	56.33%	27 Missing and 4 partials :warning:
Sources/BranchSDK/BranchOpenRequest.m	25.00%	2 Missing and 1 partial :warning:
Sources/BranchSDK/BNCServerRequestQueue.m	50.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1351 +/- ## ========================================== + Coverage 51.02% 51.27% +0.25% ========================================== Files 66 66 Lines 10143 10092 -51 Branches 3721 3697 -24 ========================================== Hits 5175 5175 + Misses 4702 4654 -48 + Partials 266 263 -3 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.