Update on "[ET-VK] Print op breakdown in tsv format"

Use boolean flag to switch between nicely-formatted space separator and spreadsheet-ready tab operator. Motiviation is similar to #7035 in facilitating copy-paste of results to a gsheet.

Differential Revision: [D68345444](https://our.internmc.facebook.com/intern/diff/D68345444/)

[ghstack-poisoned]

Author: jorgep31415

backends/vulkan/runtime/vk_api/QueryPool.cpp

@@ -233,7 +233,6 @@ std::string QueryPool::generate_string_report() {
   return ss.str();
 }
 
-
 std::string QueryPool::generate_tsv_string_report() {
   std::lock_guard<std::mutex> lock(mutex_);
 

backends/vulkan/runtime/vk_api/QueryPool.h

@@ -106,6 +106,7 @@ class QueryPool final {
   operator bool() const {
     return querypool_ != VK_NULL_HANDLE;
   }
+
  private:
   std::string generate_string_report();
   std::string generate_tsv_string_report();