OSDOCS-2875: global Azure availability sets in 4.10

[jeana-redhat]

For OSDOCS-2875, which documents OCPCLOUD-1223

Notes:
WIP, so far have attempted to refer to avail sets as an alternative to avail zones where appropriate. Added label to sample YAML.

Previews:

• Sample YAML in Creating a machine set on Azure
• Sample YAML in Creating infrastructure machine sets
• Machine API overview
• Creating infrastructure machine sets for production environments (Machine management book)
• Creating infrastructure machine sets for production environments (Post-install cluster tasks)
• Short-circuiting machine health check remediation
• Understanding pod affinity
• MTC Known issues - last one, BZ1947487. Not sure if this availability zones concern will also apply to availability sets.

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[jeana-redhat]

@sunzhaohua2 I see you did the test plan for OCPCLOUD-868, so could you please take a look at this for QA verification?

[skrthomas]

LGTM!

[sunzhaohua2]

/lgtm

[jeana-redhat]

/cherrypick enterprise-4.10

[openshift-cherrypick-robot]

@jeana-redhat: new pull request created: #41531

In response to this:

/cherrypick enterprise-4.10

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