Added private endpoint Bicep snippet

[johnlokerse]

Contributing a snippet

• [x] I have a snippet that is either a single, generic resource or multi resource that uses parent-child syntax
• [x] I have checked that there is not an equivalent snippet already submitted
• [x] I have used camelCasing unless I have a justification to use another casing style
• [x] I have placeholders values that correspond to their property names (e.g. dnsPrefix: 'dnsPrefix'), unless it's a property that MUST be changed or parameterized in order to deploy. In that case, I use 'REQUIRED' e.g. keyData
• [x] I have my symbolic name as the first tab stop ($1) in the snippet. e.g. res-aks-cluster.bicep
• [x] I have a resource name property equal to "name"
• [x] If applicable, I have set the location property to location: /*${<id>:location}*/'location' (not resourceGroup().location) where <id> is a placeholder id, and added param location string to the test's main.bicep file so that the resulting main.combined.bicep file used in the tests compiles without errors
• [x] I have verified that the snippet deploys correctly when used in the context of an actual bicep file

Microsoft Reviewers: Open in CodeFlow