AzureMonitor: Azure settings in Grafana server config (#33728)

* Azure cloud settings

* Fix typos

* Grouped Azure settings

* Doc fixes

* Some settings are not needed

* Updated cloud name aliases

pkg/setting/setting.go

@@ -284,6 +284,9 @@ type Cfg struct {
 	AWSAssumeRoleEnabled    bool
 	AWSListMetricsPageLimit int
 
+	// Azure Cloud settings
+	Azure AzureSettings
+
 	// Auth proxy settings
 	AuthProxyEnabled          bool
 	AuthProxyHeaderName       string
@@ -900,6 +903,7 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 
 	cfg.readLDAPConfig()
 	cfg.handleAWSConfig()
+	cfg.readAzureSettings()
 	cfg.readSessionConfig()
 	cfg.readSmtpSettings()
 	cfg.readQuotaSettings()