Fix: azurerm_lb zones should accept multiple

[kazimierzbudzyk]

Addresses #12215

Azure LBs changed the behaviour for zonal redundancy (https://azure.microsoft.com/en-gb/updates/zone-behavior-change/), with that change zonal-redundant LBs are now configured by declaring zones = ["1", "2", "3"] (which is currently not allow).

This PR changes the schema to allow declaring more than one AZ for azurerm_lb(Single -> Multiple).

[WodansSon]

@kazimierzbudzyk thank you for this PR but this appears to be a dupe of #12208 ?

[katbyte]

thanks @kazimierzbudzyk - but i'm going to close this as its a duplicate of #12208 where msft is working on a fix for this issue that will go out this week

[kazimierzbudzyk]

@WodansSon @katbyte yes, makes perfect sense to close in favor of the other PR (didn't notice it). Thanks for taking a look!

[github-actions]

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[github-actions]

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