Making user mapping optional, Adding telemetry and string changes

[Bhavikshah123]

This PR takes care of the following -

1. Make user mapping optional as per discussion, don't want the cx to migrate databases just because logins associated with it cannot be migrated. So making it optional.
2. Added newlines between errors displayed in validation status box
3. Added LoginMigrationPreValidationStarted, LoginMigrationPreValidationSuccessful, LoginMigrationPreValidationFailed
4. String changes

5. Modified AAD domain errors to Entra Errors by consuming new login nuget having the changes

[coveralls]

Pull Request Test Coverage Report for Build 11248941761

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 41.727%

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Totals
Change from base Build 11185654865:	0.02%
Covered Lines:	30730
Relevant Lines:	68916

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💛 - Coveralls