fix(TacitRed-SentinelOne): Remove orphaned Playbooks variable

- Removed unused 'Playbooks' and '_Playbooks' variables from mainTemplate.json
- These orphaned variables may have been causing duplicate playbook entries in Content Hub
- Regenerated 3.0.0.zip

Note: Reviewer should delete existing solution and reinstall on a clean workspace
to avoid seeing duplicate entries from previous deployment.

Author: mazamizo21

Solutions/TacitRed-SentinelOne/Package/3.0.0.zip

@@ -36,8 +36,6 @@
     "_solutionVersion": "3.0.0",
     "solutionId": "data443.azure-sentinel-solution-tacitred-sentinelone-ioc-automation",
     "_solutionId": "[variables('solutionId')]",
-    "Playbooks": "Playbooks",
-    "_Playbooks": "[variables('Playbooks')]",
     "blanks": "[replace('b', 'b', '')]",
     "playbookVersion1": "1.0",
     "playbookContentId1": "TacitRedToSentinelOne",