[CP-stable]Make sure usesUnsupportedDependencyVersions property exists before checking it (flutter#154270)

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### Issue Link:
What is the link to the issue this cherry-pick is addressing?

flutter#153668. Original PR at flutter#154121.

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Fixes a tool crash case when building for Android.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

Causes a crash when building for Android in some cases.

### Workaround:
Is there a workaround for this issue?

Build with the `--android-skip-build-dependency-validation` flag.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

< Replace with validation steps here >

Author: flutteractionsbot

packages/flutter_tools/gradle/src/main/groovy/flutter.groovy

@@ -340,7 +340,7 @@ class FlutterPlugin implements Plugin<Project> {
                         "dependency_version_checker.gradle.kts")
                 project.apply from: dependencyCheckerPluginPath
             } catch (Exception e) {
-                if (!project.usesUnsupportedDependencyVersions) {
+                if (!project.hasProperty("usesUnsupportedDependencyVersions") || !project.usesUnsupportedDependencyVersions) {
                     // Possible bug in dependency checking code - warn and do not block build.
                     project.logger.error("Warning: Flutter was unable to detect project Gradle, Java, " +
                             "AGP, and KGP versions. Skipping dependency version checking. Error was: "