[BUG] Example response in "Find Cases by Alert" topic is outdated

[nastasha-solomon]

The example response for the API that finds cases by alerts is outdated. With elastic/kibana#102664, the case title is now returned along with--and separate from--the alert ID. #102664 was introduced in 7.14, so will need to backport this change from 8.1-7.14.

Current:

["8af6ac20-74f6-11ea-b83a-553aecdb28b6", "a18b38a0-71b0-11ea-a0b2-c51ea50a58e2"]

Correct:

[
    {
        "id": "8af6ac20-74f6-11ea-b83a-553aecdb28b6",
        "title": "Test 1"
    },
    {
        "id": "a18b38a0-71b0-11ea-a0b2-c51ea50a58e2",
        "title": "Test 2"
    }
]

cc: @cnasikas