[Localization] Create a new branch for the automated PRs (#18881)

In my Localization inspection, I wanted to figure out why the automated
PRs I was creating in Pipelines were auto-closing themselves a few hours
after creating them -
[example](#18713).

There are a few different steps in the localization process and long
story short is that I am creating these PRs from the Localization
branch. Each commit into main runs a tool that alerts the Loc team and
it syncs up our Localization branch to our main branch which temporarily
deletes our Localization branch thus closing the automated PR!

This PR creates a new unique branch for each Localization PR so that we
can keep updating the Loc team, but also make sure syncing the
Localization branch will not delete this PR.

Testing this created this PR below:
#18880

tools/devops/automation/build-lego.yml

@@ -54,7 +54,7 @@ trigger:
 stages:
 
 - ${{ if eq(parameters.runGovernanceTests, true) }}:
-  - stage: governance_checks
+  - stage: LocalizationChanges
     displayName: 'Governance Checks'
     jobs:
     - job: governance
@@ -84,11 +84,18 @@ stages:
 
           git fetch origin
 
+          # create a new branch from the Localization branch for our PR in case the Localization branch gets overwritten
+          git checkout Localization
+          git checkout -b Localization-Automated-$(Build.BuildNumber)
+          git push origin Localization-Automated-$(Build.BuildNumber)
+
+          git checkout main
+
           gh pr create `
           --title "Bring changes from Localization branch #$(Build.BuildNumber)" `
           --body "The OneLoc team creates these translations to be consumed later on in the second step of the Localization process. We need to bring these into the main branch in order to continue the process." `
           --base main `
-          --head Localization `
+          --head Localization-Automated-$(Build.BuildNumber) `
           --label not-notes-worthy `
           --milestone Future `
           --draft=false