Add AzureServiceTags with common Azure service tags for NSG rules

[Copilot]

Description

Adds AzureServiceTags static class providing well-known Azure service tag constants for use as from/to parameters in NSG rule methods and AzureSecurityRule address prefix properties. This gives users discoverability via IntelliSense instead of requiring them to know the magic strings.

Tags included: Internet, VirtualNetwork, AzureLoadBalancer, AzureTrafficManager, Storage, Sql, AzureCosmosDB, AzureKeyVault, EventHub, ServiceBus, AzureContainerRegistry, AppService, AzureActiveDirectory, AzureMonitor, GatewayManager

var subnet = vnet.AddSubnet("web", "10.0.1.0/24")
    .AllowInbound(port: "443", from: AzureServiceTags.AzureLoadBalancer, protocol: SecurityRuleProtocol.Tcp)
    .DenyInbound(from: AzureServiceTags.Internet);

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire.dev issue:
      • New issue
  • No

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[eerhardt]

@copilot - change this to use the nameof pattern.

[Copilot]

Done — switched all 15 constants to use nameof in dba2286.

[eerhardt]

@copilot Rename this class and file to just AzureServiceTags. I think "network" is redundant.

[Copilot]

Renamed class and file to AzureServiceTags in 3a6d50c.