refactor(agent): replace metadata.is_case_manager with metadata.variant #4958

Job	Run time
build-wheels	0s
test-uipath-langchain	0s
${{ matrix.testcase }} / ${{ matrix.environment }} / ${{ ((matrix.use_azure_chat && 'UiPathAzureChatOpenAI') \|\| 'UiPathChat') }}	-1s
discover-testcases	-1s
notify-on-failure	0s
	-2s

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