fix: Pass qnaId in value attribute of multiturn prompts

[Arsh-Kashyap]

Fixes #4253

Description

Store qnaId in the prompts so that its readily available everytime the prompt is clicked

Specific Changes

• Changed prompt type from "imBack" to "messageBack"
• pass qnaId as value in prompts
• Check if value has qnaId before resetting dialogOptions.

Testing

[coveralls]

Pull Request Test Coverage Report for Build 2467656099

• 3 of 4 (75.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.004%) to 84.477%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libraries/botbuilder-ai/src/qnaMakerDialog.ts	3	4	75.0%

Totals
Change from base Build 2462448523:	-0.004%
Covered Lines:	19903
Relevant Lines:	22312

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💛 - Coveralls