[BUG] Fixing typo in integ test workflow

[sejli]

Description

Fixes typo in GitHub variable. Previously, the workflow would only work on main branch.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

Merging #236 (09b8205) into main (dd6f4d6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #236   +/-   ##
=======================================
  Coverage   86.27%   86.27%           
=======================================
  Files          15       15           
  Lines         204      204           
  Branches       40       40           
=======================================
  Hits          176      176           
  Misses         26       26           
  Partials        2        2           

Flag	Coverage Δ
dashboards-search-relevance	86.27% <ø> (ø)

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[github-actions]

The backport to 2.8 failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/dashboards-search-relevance/backport-2.8 2.8
# Navigate to the new working tree
pushd ../.worktrees/dashboards-search-relevance/backport-2.8
# Create a new branch
git switch --create backport-236-to-2.8
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 17acc146fe0befa3b4181efc1b15397b89074d1c
# Push it to GitHub
git push --set-upstream origin backport-236-to-2.8
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/dashboards-search-relevance/backport-2.8

Then, create a pull request where the base branch is 2.8 and the compare/head branch is backport-236-to-2.8.