feat(ir): add typed builder for AzureWebApp@1

[github-actions]

Summary

Adds a typed builder struct for AzureWebApp@1 to the ado-aw IR.

Motivation

Previously, any code that needed to emit this ADO task step had to hand-craft
TaskStep::new(...) with raw string input keys. This PR introduces a typed
builder struct (new(<required>) + typed optional setters + into_step()) so
required inputs are positional, optional inputs and their constrained values are
type-checked, and call sites stop using stringly-typed keys.

Changes

• src/compile/ir/tasks/azure_web_app.rs: new AzureWebApp builder struct
  with AppType and DeploymentMethod typed enums, plus 10 #[cfg(test)] mod tests unit tests
• src/compile/ir/tasks/mod.rs: pub mod azure_web_app; declaration
  (alphabetical order, after azure_powershell)

ADO Task Reference

• Task: AzureWebApp@1
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/azure-web-app-v1)
• Required inputs: azureSubscription, appType, appName, package
• Optional inputs: deployToSlotOrASE, resourceGroupName, slotName,
  customDeployFolder, runtimeStack (Linux), startUpCommand (Linux),
  customWebConfig (Windows), deploymentMethod
• Typed enums: AppType (WebApp | WebAppLinux), DeploymentMethod
  (Auto | ZipDeploy | RunFromPackage)

Validation

• cargo build --all-targets
• cargo test (10 new tests pass; full suite green)
• cargo clippy --all-targets --all-features --workspace -- -D warnings

---

Created by the ado-task-ir-contributor workflow.

Warning

Firewall blocked 2 domains

The following domains were blocked by the firewall during workflow execution:

• spsprodeus21.vssps.visualstudio.com
• spsprodweu4.vssps.visualstudio.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "spsprodeus21.vssps.visualstudio.com"
    - "spsprodweu4.vssps.visualstudio.com"

See Network Configuration for more information.

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