Task/Bug: Implement label function for KeyVault tags to ignore bad character label

[melonrush13]

Some characters allowed in Kube labels are not allowed in Azure tags.
Bad Characters:
<, >, %, , /, ?

We want to use the function in helpers/labels (from #814) to ignore the above bad characters.
We want to return the rest of the labels in the format expected by Azure for tag, and ignore the ones which are 'invalid'.

Done criteria

• Labels Function is implemented in KeyVault
• User is able to create a KeyVault with an improper label, and it still successfully provisions without the invalid tag.

User story reference

#