[#6542] Applying BotMessageSerializerSettings.MaxDepth doesn't seem to work

[ceciliaavila]

Fixes #6542

Description

This PR sets the MaxDepth property as null in the MemoryStorage class' JsonSerializer to avoid the "The reader’s MaxDepth of 64 has been exceeded" error.
It also sets the property in other classes, with a similar implementation, that were skipped in the original issue.

Specific Changes

• Set MaxDepth property to null in the serializer used in the following classes:
• MemoryStorage
• BlobStorage
• BlobTranscriptStore
• AzureBlobStorage
• AzureBlobTranscriptStore
• TextEntityRecognizer
• ProtocolMessage
• OAuthClient
• SlackHelper

Testing

Here we can see a bot with a dialogs loop failing in loop 10 and after the fix, working as expected in loop 11.

[coveralls]

Pull Request Test Coverage Report for Build 328759

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.002%) to 79.023%

---

Files with Coverage Reduction	New Missed Lines	%
/libraries/Microsoft.Bot.Builder/MemoryStorage.cs	4	92.0%

Totals
Change from base Build 328040:	0.002%
Covered Lines:	25602
Relevant Lines:	32398

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💛 - Coveralls

[BruceHaley]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll

[462sai]

Hi @ceciliaavila

Could you please confirm this fix is released? if yes please confirm the botbuilder version

Regards,
Sai.