Move around benchmark git config

[jaydeluca]

Fixes #14818

The .github/scripts/use-cla-approved-bot.sh script was being run from a differnt directory from where the benchmark git operations are being done (./gh-pages), so moving the config commands directly into the script that runs in that other directory

Fixes the error:

Run git add benchmark-overhead/results
Author identity unknown

*** Please tell me who you are.

Run

  git config --global user.email "[email protected]"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: empty ident name (for <runner@runnervm3ublj.3xvpnnmqe0pufide3cozgi5fjc.cx.internal.cloudapp.net>) not allowed
Error: Process completed with exit code 128.

[trask]

Can you keep the existing step (with your new implementation) and add a comment why not using the script? (So I don't accidentally "fix" it later)

[trask]

I wonder if this would work?

Suggested change

	run: .github/scripts/use-cla-approved-bot.sh
	working-directory: ./gh-pages

[trask]

or maybe it needs to be

run: ../.github/scripts/use-cla-approved-bot.sh
working-directory: ./gh-pages