[OBX-UX-MGMT] Test plan for Rules and alerts, Overview page, and Cases (

elastic#212097)

## Summary

Adding a UI test plan for Rules, Alerts, Overview page, and Cases

(cherry picked from commit 3535d86)

x-pack/solutions/observability/plugins/observability/dev_docs/rules_alerts_cases_overviewpage.md

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+
+# Test plan for: Rules, Alerts, Overview page, and Cases
+
+This plan will cover the UI part (not API) for:
+
+- Rules
+- Alerts
+- Overview page
+- Cases
+
+## Data generation
+
+> [!WARNING]
+> This guide will not cover how to run Kibana and ES locally. It assumes both instances are running before starting the data ingestion 
+
+> [!TIP]
+> The following commands use [synthtrace](https://github.com/elastic/kibana/blob/main/packages/kbn-apm-synthtrace/README.md) to generate some data that will be used to test the rules.
+Synthtrace has many scenarios, any of them could work as long as it has data that makes sense with the rules that need to be tested. 
+
+For this test will use `logs_traces_hosts` scenario.
+
+```
+node scripts/synthtrace.js logs_traces_hosts --live
+```
+
+That will generate data in
+`metrics-system*,metrics-kubernetes*,metrics-docker*,metrics-aws*`,
+`traces-apm*,metrics-apm*,logs-apm*`,
+`logs-*-*,cloud-logs-*-*`
+
+> [!NOTE]
+> The above indices will be used later to create the rules' data views.
+
+## Rules and alerts
+
+### Creation
+
+- Login to Kibana
+- Form Kibana side nav click `Alerts` under `Observability`
+- Click `Manage rules` on the right top side.
+- Click `Create Rule` button on the right top side.
+- From the `Select rule type` modal select (Repeat this part for each rule). The above mentioned indices would be used either to create a data view or as index pattern:
+  - Custom Threshold
+  - Metric Threshold
+  - Inventory Threshold
+  - APM Latency threshold
+  - APM Error count
+  - APM Failed transaction rate
+  - Anomaly (it's hard to setup up locally as it relies on ML. Use oblt-cli instead)
+  - ESQ
+  - Logs threshold
+
+> [!NOTE]
+>
+> - Create rules with and without groupBy.
+> - Create rules with and without filters.
+> - Create rules with different types of aggregations (if applicable).
+> - Create rules with check and unchecked Alert on no data.
+> - Create rules with Actions (Log connector), and check if the action variables are logged.
+
+### Rule details and rules actions
+
+Visit the rule details page, then check and test:
+
+- Alerts table
+  - UI filter
+  - Search bar
+  - Time range
+- Execution history with response filter and time range
+- Alert activity by clicking on "Active now" and how that reflects on the alert table
+- Enable/Disable the rule.
+- Snooze the rule
+- Edit the rule
+
+### Alerts
+
+Visit the alerts page, then check and test:
+
+- Alert table
+  - Update the columns and fields
+  - Change the time range
+  - Use __Group alerts by__ option
+  - Change Table density and lines per row
+  - Use `Actions` menu items (Add to exciting and new case, View rule details, etc.)
+- Use the UI filters (Show all, Active, Recovered, and Untracked) and see how it reflects the results in the alert table
+- Use the Search bar and see how it reflects the results in the alert table
+- Click on the Disabled and Snoozed at the top, it should lead to the rules page with the right filters
+
+## Overview page
+
+Visit the Overview page under Observability, then check and test:
+
+- The 4 sections (Alerts, Log Events, Hosts, and Services) are visible and show data.
+- Change the time range at the top of the page, it should change the data shown in the 4 sections.
+- Try the links of each section: "Show alerts", "Show logs", "Show inventory", and "Show service inventory".
+
+> [!NOTE]
+>
+> If there is not data showing, check if the data generation is working, and the time range is correct.
+
+## Cases
+
+Visit the Cases page under Observability, then check and test:
+
+- Create many cases with different types of Severity and description
+- Cases table
+  - Check all cases are visible
+  - Apply filters and check how it reflects on the cases table
+- Cases
+  - Open one case
+  - Add comments and change the Sort by.
+  - Click on "Mark in progress"
+  - Edit the fields in the right side panel
+  - Change the status from the status drop down-menu at the top left.
+  - Open the `Files` tab and add a file
+    - Download it
+    - Delete it
+  - Open the `Observables` tab and add an Observable e.g host, IP
+    - Edit it
+    - Delete it
+From the Alerts table, go to the Alerts page
+  - On an alert click the more button `...` in the alert table, then click `Add to existing case`
+  - On an alert click the more button `...` in the alert table, then click `Add to new case`
+  - Click on the toast that appears after each action and verify that the alert was added correctly
+  - Open the `Alerts` tab and check all the added alerts to that case