{Core} Log allow_broker configuration in telemetry

[evelyn-ys]

Description

Fix #23956

This PR adds allow_broker configuration in telemetry when it's loaded and used for calling msal

Testing Guide

Scenario 1: Test telemetry logging when no allow_broker is configured

• Run commands:
  az login
az group show -g {resource_group_name}

• Open $home_dir/.azure/telemetry/cache file and check the record data, you will find "Context.Default.AzureCLI.AllowBroker": "None" for both commands

Scenario 2: Test telemetry logging when allow_broker is configured as true

• Config with az config set core.allow_broker=true

• Run commands:
  az version
az login
az group show -g {resource_group_name}

• Open $home_dir/.azure/telemetry/cache file and check the record data, you will find
  "Context.Default.AzureCLI.AllowBroker": "None" for the first command, as az version doesn't need auth, no msal call stack
  "Context.Default.AzureCLI.AllowBroker": "True" for the other two commands, this configuration is used for calling msal auth

Scenario 3: Test telemetry logging when allow_broker is configured as false

• Config with az config set core.allow_broker=false

• Run commands:
  az version
az login
az group show -g {resource_group_name}

• Open $home_dir/.azure/telemetry/cache file and check the record data, you will find
  "Context.Default.AzureCLI.AllowBroker": "None" for the first command, as az version doesn't need auth, no msal call stack
  "Context.Default.AzureCLI.AllowBroker": "False" for the other two commands, this configuration is used for calling msal auth

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[yonzhan]

telemetry for WAM feature

[jiasli]

Really descriptive PR description.