fix: lg template display wrong in visual & form editor

[alanlong9278]

Description

fix lg template display wrong in visual & form editor

Bug Repro Steps:

1. open TodoWithLuis sample
2. click deleteItem trigger.

Bugs:

1. Activity content be truncated in visual editor.
2. Inline LG content is empty in form editor when selecting SendActivity card.

Reason:

1. The activity content is the first line of lg template.
2. The sample data is incorrect. Activity.designer.id is not equal to activityId. in lg file, the content is bind to the activity id, but form editor lg content is filter by activity.designer.id, So the inline LG content will be empty in form editor.

How to fix

1. For activity content display in visual editor, there are two different way.

• If lg template is normal string like

- hi
- hello

or
- ${List-readback(user.taskLists, dialog.listType)}
show all content.

• If lg template is a text template like

[Activity
    Text = Ok, give me the exact title of the todo you would like to delete..
    SuggestedActions = Help | Cancel
]

show content behind Text =.
just like the pic show.

2. For lg template is empty in form editor, just fix the id sync in toDoWithLuis sample.

Task Item

closes #2174

Screenshots

[github-actions]

Coverage decreased (-0.04%) to 40.901% when pulling 45f619e on julong/activity into 964b8d6 on master.