Bug Report: CreateShard allows shard names with "/", which breaks other commands/components

[ajm188]

Overview of the Issue

TopoServer's CreateShard does only minimal validation on the shard name; if you create a shard with a "/" character (e.g. commerce/a/b), but without a "-" character, it is assumed to be non-range-based sharding and is therefore valid. other methods and commands will parse this as a keyspace with name commerce and a shard named a/b, which breaks those commands.

Reproduction Steps

1. use vtadmin to create a shard named commerce/a/b
2. Load vtadmin, keyspace tab shows nothing (even if you had other keyspaces previously)

Binary Version

`main`, `v16`, probably every version prior

Operating System and Environment details

n/a

Log Fragments

No response