Added latest EC module

[Tanuka-Majumder]

Added the latest Email Connector module and resolved errors by mapping PlainTextOnly attribute in the Import mapping and updated layout of Page EmailTemplateAdmin of Test Module with Responsive_Atlas_Topbar of EC as Atlas Topbar was no longer available and also mapped IMM_OpenIDMetadataMapping of EC in CreateOAUTH provider microflow of Migration Utility

[Tanuka-Majumder]

Fixes issues

• Mapping UsePlainTextOnly attribute in instead of isHTML attribute in import mapping #7
• FromDisplayName in EmailAccount and MaxAttempts in OutgoingEmailConfiguration is not used in ACT_CreateEmailAccountFromEmailSettings microflow #8
• Update latest Email Connector Module in migration utility #9

Following changes were made:
1.Updated the latest EC module from the marketplace
2.Mapped the UsePlainTextOnly attribute in import mapping instead of isHTML
3. Added FromDisplay Name and MaxAttempts in ACT_CreateEmailAccountFromEmailSettings microflow as they were missing.
4.Added a Docs folder with version string constant and readme(which include only the steps to do migration to keep it precise instead of the whole info)
5.Added a new role "TestModuleUser" in test module as it didn't have any role assigned and gave the access to pages, microflow etc to resolve the errors.
6.Added module role "EmailConnectorMigrationUtilAdmin" to migration utility and gave access to pages, microflows to resolve the errors
7.Created sub-folders in UseMe folder for microflows,snippets etc
8.Set the access rules for entities in the migration utility domain model to full read, no write (creation and deletion is also disabled) for module role "EmailConnectorMigrationUtilAdmin"

[rover886]

mpr changes reviewed manually in SP