Fixes for 'Cortex XDR Malware - Incident Enrichment' test playbook (d…

…emisto#33705)

* added 'Core REST API' for the 'Test Playbook - Cortex XDR - Retrieve File by sha256' playbook, set timeout and 'is_mockable' for the 'Test Playbook - Cortex XDR Malware - Incident Enrichment' playbook

* changed the test incident details

* added the 'Cortex XDR - IR' integration for the 'test Playbook - Cortex XDR Malware - Incident Enrichment'

* removed the 'is mockable' from the configurations of the 'Test Playbook - Cortex XDR Malware - Incident Enrichment'

* removed task that checks the 'network artifacts' context key since the test incident does not include it

* removed unnecessary comma

* fixes for for 'Test Playbook - Cortex XDR Malware - Incident Enrichment' and 'Test Playbook - MDE - Retrieve File'

* revert changes for 'Test Playbook - MDE Malware - Incident Enrichment'

* fixes for the test playbook

* re-added fixes for MDE - Retrieve File test playbook

* updated test playbook

* revert changes

* revert changes

* revert changes

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Co-authored-by: Israel Lappe <[email protected]>
Co-authored-by: rshunim <[email protected]>