Added subnet property to new-AzLoadBalancerBackendAddressConfig cmdlet. Fixed piping in Set/Remove-AzLoadBalancerBackendAddressPool

[irrogozh]

…t. Fixed piping in Set/Remove-AzLoadBalancerBacknedAddressPool cmdlets.

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[isra-fel]

Hi @irrogozh Why did you raise 2 PRs? #15496

[irrogozh]

@isra-fel , I hoped that if it's possible to merge pr to main branch - to release it faster. Changes are not coupled with API version - it's mostly fixing bugs and adding missing property.

[isra-fel]

@irrogozh yes it's OK to submit PR to main branch. However in that case, according to our PR strategies for network branch, instead of submitting an identical PR to network branch, the correct way is to

1. Submit PR to main, get it merged
2. Submit a second PR to sync main to network branch

Now that #15496 has already been merged to network-march (as I was not aware of this PR when reviewing that one), I'm planning to revert that merge and merge this PR, and you'll need to sync main to network branch after our August release. Does it sound OK to you?

[irrogozh]

@isra-fel , sounds great! please do it:)

[isra-fel]

@irrogozh so this PR was merged and network-march was reset. As plan I will notify you to sync main to network branch after next official release, which is early August.
Thanks :)