Refactoring infinite boot option retries (microsoft#392)

## Description

Last revision of infinite boot retries resulted in build errors with
VS2022 due to "unreachable code" errors.

Refactor to move loop to top level function. Refactor of microsoft#347 

For each item, place an "x" in between `[` and `]` if true. Example:
`[x]`.
_(you can also check items in the GitHub UI)_

- [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

Build with VS2022 and PcdSupportInfiniteBootRetries set to TRUE.
Build with VS2022 and PcdSupportInfiniteBootRetries set to FALSE.
Build with GCC5 and PcdSupportInfiniteBootRetries set to TRUE.

## Integration Instructions
N/A

MdeModulePkg/Universal/BdsDxe/BdsEntry.c

@@ -390,18 +390,8 @@ BootBootOptions (
   //
   // Attempt boot each boot option
   //
-  // MU_CHANGE [BEGINS]- Support infinite boot retries
-  for (Index = 0; ; Index++) {
-    if (Index == BootOptionCount) {
-      if (PcdGetBool (PcdSupportInfiniteBootRetries)) {
-        Index = 0;
-      } else {
-        break;
-      }
-    }
-
-    // MU_CHANGE [ENDS]- Support infinite boot retries
 
+  for (Index = 0; Index < BootOptionCount; Index++) {
     //
     // According to EFI Specification, if a load option is not marked
     // as LOAD_OPTION_ACTIVE, the boot manager will not automatically
@@ -1125,7 +1115,7 @@ BdsEntry (
         BootSuccess = BootBootOptions (LoadOptions, LoadOptionCount, (BootManagerMenuStatus != EFI_NOT_FOUND) ? &BootManagerMenu : NULL);
         EfiBootManagerFreeLoadOptions (LoadOptions, LoadOptionCount);
       }
-    } while (BootSuccess);
+    } while (BootSuccess || PcdGetBool (PcdSupportInfiniteBootRetries)); // MU_CHANGE add PcdSupportInfiniteBootRetries support
   }
 
   if (BootManagerMenuStatus != EFI_NOT_FOUND) {