[Deprecation] Azure Entra Sign-in Brute Force Microsoft 365 Accounts by Repeat Source

### Link to Rule

https://github.com/elastic/detection-rules/blob/b2887e592b468d3c1dd222da2b1f546154219f0d/rules/integrations/azure/credential_access_entra_signin_brute_force_microsoft_365_repeat_source.toml#L68

### Description

Overlaps with tuned rule `Microsoft 365 Brute Force via Entra ID Sign-Ins` in https://github.com/elastic/detection-rules/pull/4777. 