[Network] Mitigate Java PolicySettings captcha property rename in client.tsp (#44290)

* Mitigate Java rename for PolicySettings captcha expiration

Map captchaExpirationInMins back to captchaCookieExpirationInMins for Java in client.tsp to preserve SDK surface.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Resolve Java clientName conflict for PolicySettings captcha rename

Rename the removed property to a legacy Java name and map the new property back to captchaCookieExpirationInMins to avoid duplicate-client-name during generation.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Adjust Java PolicySettings legacy property name

Use Java clientName captchaCookieExpirationInMinsRemoved for removed property to avoid naming conflict with current property mapping.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: weidongxu-microsoft

specification/network/resource-manager/Microsoft.Network/Network/client.tsp

@@ -5401,3 +5401,15 @@ op replaceprivateDnsZoneGroupsList(
   "GetDefaultSharedKey",
   "csharp"
 );
+
+@@clientName(
+  Microsoft.Network.PolicySettings.captchaCookieExpirationInMins,
+  "captchaCookieExpirationInMinsRemoved",
+  "java"
+);
+
+@@clientName(
+  Microsoft.Network.PolicySettings.captchaExpirationInMins,
+  "captchaCookieExpirationInMins",
+  "java"
+);