Removed Uploading of perf result to git repo 'zenith-perf-data' (#6590)

## Problem
We were archiving the pref benchmarks to 

- neon DB
- git repo `zenith-perf-data`

As the pref batch ran in parallel when the uploading of results to
zenith-perf-data` git repo resulted in merge conflicts.
Which made the run flaky and as a side effect the build started failing
.

The problem is been expressed in
https://github.com/neondatabase/neon/issues/5160

## Summary of changes
As the results were not used from the git repo it was redundant hence in
this PR cleaning up the results uploading of of perf results to git repo
The shell script `generate_and_push_perf_report.sh` was using a py
script
[git-upload](https://github.com/neondatabase/neon/compare/remove-perf-benchmark-git-upload?expand=1#diff-c6d938e7f060e487367d9dc8055245c82b51a73c1f97956111a495a8a86e9a33)
and
[scripts/generate_perf_report_page.py](https://github.com/neondatabase/neon/pull/6590/files#diff-81af2147e72d07e4cf8ee4395632596d805d6168ba75c71cab58db2659956ef8)
which are not used anywhere else in repo hence also cleaning that up

## Checklist before requesting a review

- [ ] I have performed a self-review of my code.
- [ ] If it is a core feature, I have added thorough tests.
- [ ] Do we need to implement analytics? if so did you add the relevant
metrics to the dashboard?
- [ ] If this PR requires public announcement, mark it with
/release-notes label and add several sentences in this section.

## Checklist before merging

- [ ] Do not forget to reformat the commit message to not include the
above checklist

scripts/generate_and_push_perf_report.sh

@@ -8,17 +8,3 @@ SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 echo "Uploading perf report to neon pg"
 # ingest per test results data into neon backed postgres running in staging to build grafana reports on that data
 DATABASE_URL="$PERF_TEST_RESULT_CONNSTR" poetry run python "$SCRIPT_DIR"/ingest_perf_test_result.py --ingest "$REPORT_FROM"
-
-# Activate poetry's venv. Needed because git upload does not run in a project dir (it uses tmp to store the repository)
-# so the problem occurs because poetry cannot find pyproject.toml in temp dir created by git upload
-# shellcheck source=/dev/null
-. "$(poetry env info --path)"/bin/activate
-
-echo "Uploading perf result to zenith-perf-data"
-scripts/git-upload \
-    --repo=https://"$VIP_VAP_ACCESS_TOKEN"@github.com/neondatabase/zenith-perf-data.git \
-    --message="add performance test result for $GITHUB_SHA neon revision" \
-    --branch=master \
-    copy "$REPORT_FROM" "data/$REPORT_TO" `# COPY FROM TO_RELATIVE`\
-    --merge \
-    --run-cmd "python $SCRIPT_DIR/generate_perf_report_page.py --input-dir data/$REPORT_TO --out reports/$REPORT_TO.html"