CI(allure-reports): update dependencies and cleanup code (#10794)

## Problem

There are a bunch of minor improvements that are too small and
insignificant as is, so collecting them in one PR.

## Summary of changes
- Add runner arch to artifact name to make it easier to distinguish
files on S3
([ref](https://neondb.slack.com/archives/C059ZC138NR/p1739365938371149))
- Use `github.event.pull_request.number` instead of parsing
`$GITHUB_EVENT_PATH` file
- Update Allure CLI and `allure-pytest`

.github/actions/run-python-test-set/action.yml

@@ -236,5 +236,5 @@ runs:
       uses: ./.github/actions/allure-report-store
       with:
         report-dir: /tmp/test_output/allure/results
-        unique-key: ${{ inputs.build_type }}-${{ inputs.pg_version }}
+        unique-key: ${{ inputs.build_type }}-${{ inputs.pg_version }}-${{ runner.arch }}
         aws-oicd-role-arn: ${{ inputs.aws-oicd-role-arn }}