[SDK-2485] Remove cached events

[gdeluna-branch]

Reference

SDK-2488 -- [Android] [Spike] Factor out persisted events/ In-memory only execution

Description

Behavior between the iOS and Android SDKs concerning what to do with "cached events" has been inconsistent and has led to undesirable behavior. This PR simply removes the notion of cached events, which are read from disk only when the Branch Singleton instance is initialized.

Events that fail during app foreground (no internet, failed server request) are not stored and are thus lost, never persisted to the disk. Further, only opens were able to be serialized. #1215

v1/url was serialized, but never replayed.

Background processing of events is not yet in scope.

Keeping utility function as other unrelated tests have a dependency on manually creating ServerRequest objects.

Testing Instructions

Prior behavior: open events will be added to the queue and persisted. Immediately background and close the app before the network request is executed and the request will be replayed.

After: SDK skips this steps and proceeds to process new open request, by design.

Risk Assessment [LOW]

• I, the PR creator, have tested — integration, unit, or otherwise — this code.

Reviewer Checklist (To be checked off by the reviewer only)

• JIRA Ticket is referenced in PR title.
• Correctness & Style
  • Conforms to AOSP Style Guides
  • Mission critical pieces are documented in code and out of code as needed.
• Unit Tests reviewed and test issue sufficiently.
• Functionality was reviewed in QA independently by another engineer on the team.

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

[NidhiDixit09]

Looks good to me.