Use prod feed for Azure Linux 3.0

[mthalman]

Builds of the Azure Linux 3.0 crossdeps builder Dockerfiles are failing with the following error:

#7 [3/8] RUN wget https://packages.microsoft.com/azurelinux/3.0/preview/extended/x86_64/config.repo -O /etc/yum.repos.d/azurelinux-extended.repo &&     tdnf makecache &&     tdnf install -y         libbsd-devel
#7 0.488 [0] Downloading 'https://packages.microsoft.com/azurelinux/3.0/preview/extended/x86_64/config.repo' ...
#7 0.488 Saving '/etc/yum.repos.d/azurelinux-extended.repo'
#7 0.488 HTTP response 200  [https://packages.microsoft.com/azurelinux/3.0/preview/extended/x86_64/config.repo]
#7 0.496 Loaded plugin: tdnfrepogpgcheck
#7 1.003 Refreshing metadata for: 'Azure Linux Official Microsoft Open-Source 3.0 x86_64'
#7 1.585 Refreshing metadata for: 'Azure Linux Official Base 3.0 x86_64'
#7 1.924 Refreshing metadata for: 'Azure Linux Official Microsoft Non-Open-Source 3.0 x86_64'
#7 2.347 Refreshing metadata for: 'azurelinux/3.0/preview/extended/x86_64'
#7 2.977 Metadata cache created.
#7 2.987 Loaded plugin: tdnfrepogpgcheck
#7 3.034 libbsd-devel package not found or not installed
#7 3.034 Error(1011) : No matching packages

The issue is that the command in the Dockerfile is configuring a feed that targets the preview feed. Azure Linux 3.0 is no longer in preview. Updating this to prod fixes the issue.