Rename PBISubBillingDeployableReport.EnumExt.al to PBISubBillingDeplReport.EnumExt.al (#7643)

AA0215 flags `PBISubBillingDeployableReport.EnumExt.al` as having an
invalid filename — the object name `"PBI Sub. Billing Depl. Report"`
requires the file to be named `PBISubBillingDeplReport.EnumExt.al`.

## Changes
- **Renamed** `src/Apps/W1/Subscription Billing/App/Power
BI/PBISubBillingDeployableReport.EnumExt.al` →
`PBISubBillingDeplReport.EnumExt.al` — filename-only change, no content
modifications.

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mynjj <61959453+mynjj@users.noreply.github.com>

Author: Copilot