delete encryption key on mytoken revocation

internal/db/dbmigrate/v0.3.0.go

internal/db/dbrepo/encryptionkeyrepo/encryptionkeyRepo.go

internal/db/dbrepo/mytokenrepo/mytokenrepohelper/helpers.go

internal/db/dbrepo/refreshtokenrepo/refreshtoken.go

shared/mytoken/mytokenHandler.go

shared/mytoken/rotation/rotation.go