feat: add new vaccine candidates chart with FDA approval filter and update dashboard configuration

- Add new pie chart "Vaccine Candidates per Phase" (ID 163) with FDA approved indications filter
- Update existing chart 121 query context configuration
- Set dashboard slug to "covid" and add new chart to dashboard layout
- Clean up dashboard metadata by removing unused color scheme configurations

charts/Vaccine_Candidates_per_Phase_163.yaml

@@ -0,0 +1,49 @@
+slice_name: Vaccine Candidates per Phase
+description: null
+certified_by: null
+certification_details: null
+viz_type: pie
+params:
+  datasource: 13__table
+  viz_type: pie
+  slice_id: 121
+  groupby:
+  - clinical_stage
+  metric: count
+  adhoc_filters:
+  - expressionType: SIMPLE
+    subject: fda_approved_indications
+    operator: IS NOT NULL
+    operatorId: IS_NOT_NULL
+    clause: WHERE
+    sqlExpression: null
+    isExtra: false
+    isNew: false
+    datasourceWarning: false
+    filterOptionName: filter_lpyfep8j58_o4u3340k07
+  row_limit: 10000
+  sort_by_metric: true
+  color_scheme: supersetColors
+  show_labels_threshold: 5
+  show_legend: false
+  legendType: scroll
+  legendOrientation: top
+  label_type: key
+  number_format: SMART_NUMBER
+  date_format: smart_date
+  show_labels: true
+  labels_outside: true
+  label_line: true
+  outerRadius: 61
+  donut: true
+  innerRadius: 44
+  extra_form_data: {}
+  dashboards:
+  - 10
+query_context: '{"datasource":{"id":13,"type":"table"},"force":false,"queries":[{"filters":[{"col":"fda_approved_indications","op":"IS
+  NOT NULL"}],"extras":{"having":"","where":""},"applied_time_extras":{},"columns":["clinical_stage"],"metrics":["count"],"orderby":[["count",false]],"annotation_layers":[],"row_limit":10000,"series_limit":0,"group_others_when_limit_reached":false,"order_desc":true,"url_params":{},"custom_params":{},"custom_form_data":{},"post_processing":[{"operation":"contribution","options":{"columns":["count"],"rename_columns":["count__contribution"]}}]}],"form_data":{"datasource":"13__table","viz_type":"pie","slice_id":121,"groupby":["clinical_stage"],"metric":"count","adhoc_filters":[{"expressionType":"SIMPLE","subject":"fda_approved_indications","operator":"IS
+  NOT NULL","operatorId":"IS_NOT_NULL","clause":"WHERE","sqlExpression":null,"isExtra":false,"isNew":false,"datasourceWarning":false,"filterOptionName":"filter_lpyfep8j58_o4u3340k07"}],"row_limit":10000,"sort_by_metric":true,"color_scheme":"supersetColors","show_labels_threshold":5,"show_legend":false,"legendType":"scroll","legendOrientation":"top","label_type":"key","number_format":"SMART_NUMBER","date_format":"smart_date","show_labels":true,"labels_outside":true,"label_line":true,"outerRadius":61,"donut":true,"innerRadius":44,"extra_form_data":{},"dashboards":[10],"force":false,"result_format":"json","result_type":"full"},"result_format":"json","result_type":"full"}'
+cache_timeout: null
+uuid: 0f942970-9d2c-46c5-9eb3-f6cffa792d25
+version: 1.0.0
+dataset_uuid: 974b7a1c-22ea-49cb-9214-97b7dbd511e0