Fix SDK version format to use build numbers for 2025.3 EAP

- Change sdkVersion from '2025.3' to '253.25908.29' for gateway, community, and ultimate profiles
- Matches the marketplace plugin versions already updated in previous commit
- Rider keeps using '2025.3-SNAPSHOT' as it uses snapshot builds
- Fixes 'No IntelliJ Platform dependency found with IC-2025.3' error

Author: aseemxs

buildSrc/src/main/kotlin/software/aws/toolkits/gradle/intellij/IdeVersions.kt

@@ -156,11 +156,11 @@ object IdeVersions {
         Profile(
             name = "2025.3",
             gateway = ProductProfile(
-                sdkVersion = "2025.3",
+                sdkVersion = "253.25908.29",
                 bundledPlugins = listOf("org.jetbrains.plugins.terminal")
             ),
             community = ProductProfile(
-                sdkVersion = "2025.3",
+                sdkVersion = "253.25908.29",
                 bundledPlugins = commonPlugins + listOf(
                     "com.intellij.java",
                     "com.intellij.gradle",
@@ -176,7 +176,7 @@ object IdeVersions {
                 )
             ),
             ultimate = ProductProfile(
-                sdkVersion = "2025.3",
+                sdkVersion = "253.25908.29",
                 bundledPlugins = commonPlugins + listOf(
                     "JavaScript",
                     "JavaScriptDebugger",