feat: add dataset and chart for video engagement dropoff

tutoraspects/templates/aspects/build/aspects-superset/openedx-assets/assets/charts/Video_engagement_by_section_subsection.yaml

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+_file_name: Video_engagement_by_section_subsection.yaml
+cache_timeout: null
+certification_details: null
+certified_by: null
+dataset_uuid: 247a55b3-d44e-442e-ba92-71bf7976b192
+description: null
+params:
+  adhoc_filters: []
+  annotation_layers: []
+  color_scheme: supersetColors
+  comparison_type: values
+  extra_form_data: {}
+  forecastInterval: 0.8
+  forecastPeriods: 10
+  groupby: []
+  legendOrientation: top
+  legendType: scroll
+  metrics:
+  - aggregate: null
+    column: null
+    datasourceWarning: false
+    expressionType: SQL
+    hasCustomLabel: true
+    label: All videos viewed
+    optionName: metric_ybd2rhz43lp_s2rxtvynidt
+    sqlExpression: |-
+      countIf("section/subsection video engagement" = 'All videos viewed')
+  - aggregate: null
+    column: null
+    datasourceWarning: false
+    expressionType: SQL
+    hasCustomLabel: true
+    label: At least one video viewed
+    optionName: metric_uly1n6wzzl_t4av1e6urzi
+    sqlExpression: |-
+      countIf("section/subsection video engagement" = 'All pages viewed' or "section/subsection video engagement" = 'At least one video viewed')
+  only_total: true
+  order_desc: true
+  orientation: vertical
+  rich_tooltip: true
+  row_limit: 10000
+  show_empty_columns: true
+  show_legend: true
+  sort_series_type: sum
+  time_grain_sqla: P1D
+  tooltipTimeFormat: smart_date
+  truncate_metric: true
+  viz_type: echarts_timeseries_bar
+  xAxisLabelRotation: 45
+  x_axis: section/subsection name
+  x_axis_sort_asc: true
+  x_axis_sort_series: name
+  x_axis_sort_series_ascending: true
+  x_axis_time_format: smart_date
+  x_axis_title_margin: 15
+  y_axis_bounds:
+  - null
+  - null
+  y_axis_format: SMART_NUMBER
+  y_axis_title: Number of Learners
+  y_axis_title_margin: 30
+  y_axis_title_position: Left
+query_context: |-
+  {"datasource":{"id":226,"type":"table"},"force":false,"queries":[{"filters":[],"extras":{"having":"","where":""},"applied_time_extras":{},"columns":[{"timeGrain":"P1D","columnType":"BASE_AXIS","sqlExpression":"section/subsection name","label":"section/subsection name","expressionType":"SQL"}],"metrics":[{"expressionType":"SQL","sqlExpression":"countIf(\"section/subsection video engagement\" = 'All videos viewed')","column":null,"aggregate":null,"datasourceWarning":false,"hasCustomLabel":true,"label":"All videos viewed","optionName":"metric_ybd2rhz43lp_s2rxtvynidt"},{"expressionType":"SQL","sqlExpression":"countIf(\"section/subsection video engagement\" = 'All pages viewed' or \"section/subsection video engagement\" = 'At least one video viewed')","column":null,"aggregate":null,"datasourceWarning":false,"hasCustomLabel":true,"label":"At least one video viewed","optionName":"metric_uly1n6wzzl_t4av1e6urzi"}],"orderby":[[{"expressionType":"SQL","sqlExpression":"countIf(\"section/subsection video engagement\" = 'All videos viewed')","column":null,"aggregate":null,"datasourceWarning":false,"hasCustomLabel":true,"label":"All videos viewed","optionName":"metric_ybd2rhz43lp_s2rxtvynidt"},false]],"annotation_layers":[],"row_limit":10000,"series_columns":[],"series_limit":0,"order_desc":true,"url_params":{},"custom_params":{},"custom_form_data":{},"time_offsets":[],"post_processing":[{"operation":"pivot","options":{"index":["section/subsection name"],"columns":[],"aggregates":{"All videos viewed":{"operator":"mean"},"At least one video viewed":{"operator":"mean"}},"drop_missing_columns":false}},{"operation":"flatten"}]}],"form_data":{"datasource":"553__table","viz_type":"echarts_timeseries_bar","x_axis":"section/subsection name","time_grain_sqla":"P1D","x_axis_sort_asc":true,"x_axis_sort_series":"name","x_axis_sort_series_ascending":true,"metrics":[{"expressionType":"SQL","sqlExpression":"countIf(\"section/subsection video engagement\" = 'All videos viewed')","column":null,"aggregate":null,"datasourceWarning":false,"hasCustomLabel":true,"label":"All videos viewed","optionName":"metric_ybd2rhz43lp_s2rxtvynidt"},{"expressionType":"SQL","sqlExpression":"countIf(\"section/subsection video engagement\" = 'All pages viewed' or \"section/subsection video engagement\" = 'At least one video viewed')","column":null,"aggregate":null,"datasourceWarning":false,"hasCustomLabel":true,"label":"At least one video viewed","optionName":"metric_uly1n6wzzl_t4av1e6urzi"}],"groupby":[],"adhoc_filters":[],"order_desc":true,"row_limit":10000,"truncate_metric":true,"show_empty_columns":true,"comparison_type":"values","annotation_layers":[],"forecastPeriods":10,"forecastInterval":0.8,"orientation":"vertical","x_axis_title_margin":15,"y_axis_title":"Number of Learners","y_axis_title_margin":30,"y_axis_title_position":"Left","sort_series_type":"sum","color_scheme":"supersetColors","only_total":true,"show_legend":true,"legendType":"scroll","legendOrientation":"top","x_axis_time_format":"smart_date","xAxisLabelRotation":45,"y_axis_format":"SMART_NUMBER","y_axis_bounds":[null,null],"rich_tooltip":true,"tooltipTimeFormat":"smart_date","extra_form_data":{},"dashboards":[817],"force":false,"result_format":"json","result_type":"full"},"result_format":"json","result_type":"full"}
+slice_name: Video engagement by section/subsection
+uuid: 21861f47-9e8b-4715-b1ff-e7f4aa595c14
+version: 1.0.0
+viz_type: echarts_timeseries_bar