IndicatorLED: Add compile option for deprecated property

The IndicatorLED property has been deprecated by Redfish since September
2020. The Redfish Service Validator reports a WARNING for this property:

```
WARNING - IndicatorLED: The given property is deprecated: This property has been deprecated in favor of the `LocationIndicatorActive` property.
```

The LocationIndicatorActive property is now implemented in bmcweb in
all places where IndicatorLED was implemented. So a new meson option
(redfish-allow-deprecated-indicatorled) is being added to control
whether this property is part of get or patch requests. The option is
disabled by default with plans to remove the option by March 2026.

Tested:
 - Built with option enabled and confirmed IndicatorLED still part of
   Redfish responses and can be patched.
 - Built with option disabled and confirmed Redfish Service Validator no
   longer reports the warning.
 - Built with option disabled and confirmed IndicatorLED no longer part
   of Redfish responses and patch fails appropriately.
```
curl -k -H "X-Auth-Token: $token" -H "Content-Type: application/json" -X PATCH -d '{"IndicatorLED":"Blinking"}' https://${bmc}/redfish/v1/Systems/system
{
  "error": {
    "@Message.ExtendedInfo": [
      {
        "@odata.type": "#Message.v1_1_1.Message",
        "Message": "The property IndicatorLED is not in the list of valid properties for the resource.",
        "MessageArgs": [
          "IndicatorLED"
        ],
        "MessageId": "Base.1.19.PropertyUnknown",
        "MessageSeverity": "Warning",
        "Resolution": "Remove the unknown property from the request body and resubmit the request if the operation failed."
      }
    ],
    "code": "Base.1.19.PropertyUnknown",
    "message": "The property IndicatorLED is not in the list of valid properties for the resource."
  }
}

curl -k -H "X-Auth-Token: $token" -H "Content-Type: application/json" -X PATCH -d '{"IndicatorLED":"Off"}' https://${bmc}/redfish/v1/Chassis/chassis
{
  "error": {
    "@Message.ExtendedInfo": [
      {
        "@odata.type": "#Message.v1_1_1.Message",
        "Message": "The property IndicatorLED is not in the list of valid properties for the resource.",
        "MessageArgs": [
          "IndicatorLED"
        ],
        "MessageId": "Base.1.19.PropertyUnknown",
        "MessageSeverity": "Warning",
        "Resolution": "Remove the unknown property from the request body and resubmit the request if the operation failed."
      }
    ],
    "code": "Base.1.19.PropertyUnknown",
    "message": "The property IndicatorLED is not in the list of valid properties for the resource."
  }
}
```

Change-Id: I2c0d415a7a54aa3122b18d2a1aa69bd9259d567e
Signed-off-by: Janet Adkins <janeta@us.ibm.com>
diff --git a/meson.options b/meson.options
index 86a3713..aee691d 100644
--- a/meson.options
+++ b/meson.options
@@ -301,6 +301,16 @@
                     sensors in the SensorCollection.''',
 )
 
+# BMCWEB_REDFISH_ALLOW_DEPRECATED_INDICATORLED
+option(
+    'redfish-allow-deprecated-indicatorled',
+    type: 'feature',
+    value: 'disabled',
+    description: '''Enable/disable the deprecated IndicatorLED property. The
+                    default condition is disabled. The code to enable this
+                    option will be removed by March 2026.''',
+)
+
 # BMCWEB_REDFISH_ALLOW_DEPRECATED_POWER_THERMAL
 option(
     'redfish-allow-deprecated-power-thermal',