fix: Adaptive card rendering issue in Webchat & Rerender on appId change

[srinaath]

Description

1. A bad import from webchat-component caused the rendering of adaptive cards to break. Fixed the import to be from webchat.
2. The conversation is memoized for until a new bot is opened. This makes the webchat hold on to stale MsAppId and MsPassword when the secrets are updated. Adding secret as a dependancy as well to change conversationID along with secret.
   @boydc2014 @luhan2017 Could you give this branch a go if this fixes it?

Task Item

Fixes #8226

[cypress]

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Test summary

16 • 0 • 1 • 0 • 0

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Run details

Project	Composer
Status	Passed
Commit	97ec1b6
Started	Jul 1, 2021 1:59 AM
Ended	Jul 1, 2021 2:08 AM
Duration	08:33 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 89

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[coveralls]

Coverage decreased (-0.001%) to 55.433% when pulling 97ec1b6 on fix/thumbnailcards into 7d3433a on main.

[boydc2014]

Confirmed, this PR fixed the appid\password not refreshing issue