Paging Audit: Use gEfiEventBeforeExitBootServicesGuid instead of gMuE…

…ventPreExitBootServicesGuid

Description

Now that the gEfiEventBeforeExitBootServicesGuid is available, we no longer
need to use the Mu-specific gMuEventPreExitBootServicesGuid.

- [x] Impacts functionality?
  - **Functionality** - Does the change ultimately impact how firmware functions?
  - Examples: Add a new library, publish a new PPI, update an algorithm, ...
- [ ] Impacts security?
  - **Security** - Does the change have a direct security impact on an application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
  - **Breaking change** - Will anyone consuming this change experience a break
    in build or boot behavior?
  - Examples: Add a new library class, move a module to a different repo, call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
  - **Documentation** - Does the change contain explicit documentation additions
    outside direct code modifications (and comments)?
  - Examples: Update readme file, add feature readme file, link to documentation
    on an a separate Web page, ...

How This Was Tested

N/A

Integration Instructions

N/A

UefiTestingPkg/AuditTests/PagingAudit/UEFI/Dxe/Driver/DxePagingAuditDriver.c

@@ -53,7 +53,7 @@ PagingAuditDriverEntryPoint (
                   TPL_CALLBACK,
                   DumpPagingInfoEvent,
                   NULL,
-                  &gMuEventPreExitBootServicesGuid,
+                  &gEfiEventBeforeExitBootServicesGuid,
                   &Event
                   );
   DEBUG ((DEBUG_ERROR, "%a leave - %r\n", __FUNCTION__, Status));

UefiTestingPkg/AuditTests/PagingAudit/UEFI/DxePagingAuditDriver.inf

@@ -58,7 +58,7 @@
 [Guids]
   gEfiDebugImageInfoTableGuid                   ## SOMETIMES_CONSUMES ## GUID
   gEfiMemoryAttributesTableGuid
-  gMuEventPreExitBootServicesGuid
+  gEfiEventBeforeExitBootServicesGuid
   gEfiHobMemoryAllocStackGuid                   ## SOMETIMES_CONSUMES   ## SystemTable
 
 [Protocols]