feat(arm):add CKV_AZURE_173 to ensure that API management uses at least TLS 1.2

[goldyBH]

APIManagementMinTLS12 Be aware that we use the title to create changelog automatically and therefore only allow specific prefixes - break: to indicate a breaking change, this supersedes any of the types - feat: to indicate new features or checks - fix: to indicate a bugfix or handling of edge cases of existing checks - docs: to indicate an update to our documentation - chore: to indicate adjustments to workflow files or dependency updates - platform: to indicate a change needed for the platform Additionally a scope is needs to be added to the prefix, which indicates the targeted framework, in doubt choose 'general'.

Description

ensure that API management uses at least TLS 1.2

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my feature, policy, or fix is effective and works
• [x] New and existing tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules