Fix duplicate API calls in AddInternalProviderModal on modal open

[Copilot]

When opening the AddInternalProviderModal for the first time, getClusterStatus(), listModules(), and listNodes() were called twice - once in the isShown watcher and again in the step watcher triggered by setting step = "node".

Changes

• Removed duplicate API calls from isShown watcher
• API calls now execute once through step watcher only

// Before: calls made in isShown watcher
if (!this.isResumeConfiguration) {
  this.step = "node";
  this.getClusterStatus();      // duplicate
  if (!this.isOpenLdap) {
    this.listModules();          // duplicate
    this.listNodes();            // duplicate
  }
}

// After: step watcher handles all calls
if (!this.isResumeConfiguration) {
  this.step = "node";  // triggers step watcher
}

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