🐛 fix for PERCY_GZIP flag

[prklm10]

Issue ->
We are facing error when PERCY_GZIP is set to true.
There is some race condition where we are zipping already zipped content.
I was not able to fix the race condition but i have found a workaround for this.
How to reproduce it
Snapshot.yml

- name: abc
  url: https://percy.io/integrations
- name: abc1
  url: https://percy.io/integrations
- name: abc2
  url: https://percy.io/integrations

PERCY_GZIP=true
It will fail 3/10 time with error [percy:core] TypeError: Cannot read properties of undefined (reading 'url')
Some of the content are already zipped and
Fixed build https://percy.io/9560f98d/web/pradum-debugging-9d5722f8/builds/38137551

[pankaj443]

LGTM