[PLAT-8413] Delete oversized or stale persisted errors

[nickdowell]

Goal

Prevent error event sending from being retried indefinitely in the event of HTTP or connection errors, by discarding them once more than 60 days old or if too large.

Changeset

BSGEventUploadFileOperation deletes and BSGEventUploadObjectOperation skips persistence if sending fails and

• the file was created over 60 days ago or
• the HTTP body size is greater than 1MB

BugsnagApiClient now returns the HTTP body so that its size can be checked without re-encoding. Note that the size of an event on disk may be very different from the size of the HTTP body if OnSendError callbacks make any major changes.

Testing

Adds E2E scenarios to verify that oversized and stale payloads are not retried.

[github-actions]

Bugsnag.framework binary size increased by 176 bytes from 819,680 to 819,856

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2%    +536  +0.2%    +536    __TEXT,__text
  +0.1%    +144  +0.1%    +144    Symbol Table
  +1.1%     +48  +1.1%     +48    Lazy Binding Info
  +0.6%     +44  +0.3%     +44    [__DATA]
  +0.8%     +16  +0.8%     +16    __TEXT,__const
  +0.5%     +14  +0.5%     +14    __TEXT,__objc_methtype
  +0.6%     +12  +0.6%     +12    __TEXT,__stub_helper
  +0.6%     +12  +0.6%     +12    __TEXT,__stubs
  +0.5%      +8  +0.5%      +8    Indirect Symbol Table
  +0.6%      +8  +0.6%      +8    __DATA,__la_symbol_ptr
  -0.4%      -4  -0.4%      -4    __DATA,__objc_ivar
  -0.0%     -24  -0.0%     -24    String Table
  -0.1%     -48  -0.1%     -48    __DATA,__objc_const
  -0.3%     -76  -0.3%     -76    __TEXT,__objc_methname
  [ = ]       0  -1.1%    -176    [__LINKEDIT]
  -3.2%    -514  -3.2%    -514    [__TEXT]
  +0.0%    +176  [ = ]       0    TOTAL

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