Valgrind test improvements / Parent Issue

[onurctirtir]

Copy & pasting the improvements from #188 (comment), also adding a few more things:

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• Include more test schedules in valgrind testing Include more test schedules in valgrind testing #216
• Valgrind job could use detached test structure so that we wouldn't need to have 2 jobs and things would be more clean.
  This wasn't trivial so we decided to merge the working PR as is.
  Integrating into that detached test structure has several pieces, one of them was Cache git credentials in init.sh #203
• Now we can remove tooling from tools repo (or we can deprecate it)
• We should not push weekly results into different branches Valgrind test results should be pushed to a single branch #170
• We should put branch name/sha of the HEAD and pg version to the valgrind test results
• We should collect stack traces from core dumps if any crash happens
• Research github api to understand success of last valgrind test
• Research ways to automate manual testing (maybe pushing branches and removing them automatically ?)