[PLAT-10051] Don't capture file:// URLRequests

[kstenerud]

Goal

We don't want to capture URLRequests that were actually for local files. We only want to capture network requests.

Design

Check the URL scheme and ignore any that are file.

Testing

Added extra e2e test to verify this.

[github-actions]

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2%    +136  +0.2%    +136    __TEXT,__text
  +0.0%     +32  +0.0%     +32    String Table
  +0.5%     +32  +0.5%     +32    __DATA,__cfstring
  +0.4%     +32  +0.4%     +32    __TEXT,__objc_stubs
  +0.4%     +28  +0.4%     +28    __TEXT,__gcc_except_tab
  +0.0%     +16  +0.0%     +16    Symbol Table
  +0.2%     +15  +0.2%     +15    __TEXT,__objc_methname
  +0.4%      +8  +0.4%      +8    __DATA,__objc_selrefs
  +0.1%      +5  +0.1%      +5    __TEXT,__cstring
  -0.5%     -40  -0.5%     -40    [__DATA]
  [ = ]       0  -0.3%     -48    [__LINKEDIT]
  -0.7%    -216  -0.7%    -216    [__TEXT]
  +0.0%     +48  [ = ]       0    TOTAL

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[tomlongridge]

LGTM - pending changelog entry

[lemnik]

LGTM - Pending CI