Clean up and migrate Azure tests. (#28103)

* Remove placeholder Azure test.
* Migrate Azure tests to ansible-test.
* Initial cleanup on remaining legacy Azure tests.

test/integration/targets/azure_rm_publicipaddress/aliases

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+cloud/azure
+destructive

test/integration/targets/azure_rm_publicipaddress/meta/main.yml

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+dependencies:
+  - setup_azure

test/integration/targets/azure_rm_publicipaddress/tasks/main.yml

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+- name: Remove public ip
+  azure_rm_publicipaddress:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+      state:  absent
+
+- name: Create public ip
+  azure_rm_publicipaddress:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+      allocation_method: Static
+      domain_name: autotest01
+      tags:
+          testing: testing
+          delete: on-exit
+  register: output
+
+- assert:
+      that:
+          - output.state.public_ip_allocation_method == 'Static'
+          - output.state.dns_settings.domain_name_label == 'autotest01'
+          - output.state.tags | length == 2
+          - output.state.tags.testing == 'testing'
+
+- name: Should be idempotent
+  azure_rm_publicipaddress:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+      allocation_method: Static
+      domain_name: autotest01
+      tags:
+          testing: testing
+          delete: on-exit
+  register: output
+
+- assert:
+      that: not output.changed
+
+- name: Update tags
+  azure_rm_publicipaddress:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+      tags:
+          testing: testing
+          delete: never
+          foo: bar
+  register: output
+
+- assert:
+      that:
+          - output.state.tags | length == 3
+          - output.state.tags.delete == 'never'
+
+- name: Gather facts, filtering by tag
+  azure_rm_publicipaddress_facts:
+      resource_group: "{{ resource_group }}"
+      tags:
+          - testing
+          - foo:bar
+
+- assert:
+      that: azure_publicipaddresses | length == 1
+
+- name: Purge all tags
+  azure_rm_publicipaddress:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+      tags: {}
+  register: output
+
+- assert:
+      that:
+          - output.state.tags | length == 0
+
+- name: Gather facts for a public ip
+  azure_rm_publicipaddress_facts:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+
+- assert:
+      that: azure_publicipaddresses | length == 1
+
+- name: Gather facts for all public ips
+  azure_rm_publicipaddress_facts:
+      resource_group: "{{ resource_group }}"
+
+- assert:
+      that: azure_publicipaddresses | length > 0
+
+- name: Remove public ip
+  azure_rm_publicipaddress:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+      state:  absent
+
+- name: Gather facts for a public ip
+  azure_rm_publicipaddress_facts:
+      resource_group: "{{ resource_group }}"
+      name: testing01
+
+- assert:
+      that: azure_publicipaddresses | length == 0