[PLAT-5040] Ignore OOMs that occur while the app is inactive

[nickdowell]

Goal

Ignore OOMs that occur in UIApplicationStateInactive, restoring behaviour previously introduced by #394.

Pull request #1307 (in v6.16.4) inadvertently stopped rejecting these OOMs.

Changeset

Adds BSGRunContext.inActive.
Observes UIApplicationDidBecomeActiveNotification / WillResignActiveNotification.
Checks isActive in BSGRunContextWasKilled().

Enables state tracking on tvOS, since OOMs are also reported there.

Testing

Adds an E2E scenario that simulates an OOM occurring in UIApplicationStateInactive and verifies that no error is reported.

[github-actions]

Bugsnag.framework binary size increased by 560 bytes from 814,656 to 815,216

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2%    +352  +0.2%    +352    Symbol Table
  +0.1%    +324  +0.1%    +324    __TEXT,__text
  +0.1%    +200  +0.1%    +200    String Table
  +0.9%     +32  +0.9%     +32    __DATA,__const
  +0.4%      +8  +0.4%      +8    Rebase Info
  +0.2%      +8  +0.2%      +8    __TEXT,__unwind_info
  -0.4%     -32  -0.2%     -32    [__DATA]
  -1.4%    -332  -1.4%    -332    [__TEXT]
  [ = ]       0 -12.3%    -560    [__LINKEDIT]
  +0.1%    +560  [ = ]       0    TOTAL

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