[PORT] Return invalid state instead of throwing exceptions for non-string input of TextInput action

[feich-ms]

Port microsoft/botbuilder-dotnet#4966

Description

In adaptive dialog, TextInput action only accept string values, but in some cases, non-string values such as objects will be passed into TextInput action, in such cases, it will throw exceptions instead of throw invalid prompt to users for a valid input. This is not friendly. In this fix, we added the validation of string format for all values and if it's value is not string, it will go into invalid state instead of throwing exceptions.

Specific Changes

• textInput.ts

Testing

Test cases added

[coveralls]

Pull Request Test Coverage Report for Build 544423737

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 84.679%

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Totals
Change from base Build 540977548:	0.05%
Covered Lines:	18215
Relevant Lines:	20521

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💛 - Coveralls