use minimum of region az and az count

[omrishiv]

What does this PR do?

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Limits the availability_zones_count to the minimum of the count and the region maximum

Motivation

Trying to deploy architectures with the variable availability_zones_count > number of azs in the region would fail. This takes the minimum of the two as the count.

More

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For Moderators

• E2E Test successfully complete before merge?

Additional Notes