feat: update azure backup geo codes

[jtracey93]

This pull request updates Azure region short name mappings in both the main ARM template and the private DNS zones policy set definition. The main focus is on adding support for new Azure regions, updating existing mappings, and ensuring consistency across the codebase. Additionally, the policy set definition version is incremented to reflect these changes.

Azure region short name mapping updates:

• Added new region short codes for several Azure regions, including centraluseuap, eastus2euap, eastus3, indiasouthcentral, israelnorthwest, jioindiacentral, jioindiawest, malaysiasouth, northeastus5, southcentralus2, southeastus, southeastus3, southeastus5, southwestus, and swedensouth in both eslzArm.json and Deploy-Private-DNS-Zones.json for improved regional coverage. [1] [2] [3] [4]
• Added additional region mappings specific to the policy set definition, such as austriaeast, belgiumcentral, denmarkeast, indonesiacentral, taiwannorthwest, and several US government and DoD regions. [1] [2]

Consistency and cleanup:

• Removed duplicate or misplaced region mappings from the end of the azBackupGeoCodes variable in eslzArm.json to prevent redundancy.

Versioning:

• Bumped the version of the Deploy-Private-DNS-Zones.json policy set definition from 2.4.0 to 2.5.0 to reflect the new region support and mapping updates.

Other:

• Minor whitespace and formatting cleanup in eslzArm.json.

[Springstone]

LGTM