Include type in Message Card messages

[helloviktor]

Fixes #427 by including the @type and @context fields in the MessageCard payload. According to the documentation, these fields are required.

Testing done

I rebuilt the plugin with my changes, installed it on a local Jenkins and posted a MessageCard message using the following snippet (note the adaptiveCards option was unset):

office365ConnectorSend message: 'hello there', webhookUrl: 'REDACTED'

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• Ensure that the pull request title represents the desired changelog entry
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[damianszczepanik]

link mentioned in the description is about legacy card with clear information that this should be replaced by adaptive card - can you comment on that?

[helloviktor]

Hi @damianszczepanik

As per the latest update from Microsoft on February 5, Message Card is now supported in Workflows.

Message Card support is now available in Workflows. You can continue to use the Message Card format when migrating your existing Office 365 Connectors.

Please see Retirement of Office 365 connectors within Microsoft Teams

Despite it being legacy, we intend to use it beyond the Workflows migration deadline.

[Monishguru]

When can we expect this to be merged !!

[damianszczepanik]

Merged & published

[ViliusS]

Microsoft stated that MessageCard format support for Workflows was introduced just to make it easier for customers to migrate from Connectors to Workflows. I would expect MessageCard support dropped when enough users migrate.
Since this plugin already has support for ActiveCards the better approach is to encourage users switching to ActiveCards by changing the default to ActiveCard (without the need to specify ActiveCard flag).