Rename reverted+resubmitted sdk sandbox flag

Flags that were reverted and resubmitted are not supported by the Gantry
infra. The recommended approach in these cases is to instead rename the
flag.

Test: atest SdkSandboxAuditTests SdkSandboxNextTests
Bug: 342991282
Change-Id: I26d28abcc1b75c2a3f53cf9391a403ea9c5b27a2