Improve test results format (#4549)

## Problem

The current test history format is a bit inconvenient:
- It stores all test results in one row, so all queries should include
subqueries which expand the test 
- It includes duplicated test results if the rerun is triggered manually
for one of the test jobs (for example, if we rerun `debug-pg14`, then
the report will include duplicates for other build types/postgres
versions)
- It doesn't have a reference to run_id, which we use to create a link
to allure report

Here's the proposed new format:
```
    id           BIGSERIAL PRIMARY KEY,
    parent_suite TEXT NOT NULL,
    suite        TEXT NOT NULL,
    name         TEXT NOT NULL,
    status       TEXT NOT NULL,
    started_at   TIMESTAMPTZ NOT NULL,
    stopped_at   TIMESTAMPTZ NOT NULL,
    duration     INT NOT NULL,
    flaky        BOOLEAN NOT NULL,
    build_type   TEXT NOT NULL,
    pg_version   INT NOT NULL,
    run_id       BIGINT NOT NULL,
    run_attempt  INT NOT NULL,
    reference    TEXT NOT NULL,
    revision     CHAR(40) NOT NULL,
    raw          JSONB COMPRESSION lz4 NOT NULL,
```

## Summary of changes
- Misc allure changes:
  - Update allure to 2.23.1
- Delete files from previous runs in HTML report (by using `sync
--delete` instead of `mv`)
- Use `test-cases/*.json` instead of `suites.json`, using this directory
allows us to catch all reruns.
- Until we migrated `scripts/flaky_tests.py` and
`scripts/benchmark_durations.py` store test results in 2 formats (in 2
different databases).

scripts/comment-test-report.js

@@ -223,6 +223,7 @@ module.exports = async ({ github, context, fetch, report }) => {
     } else {
         commentBody += `#### No tests were run or test report is not available\n`
     }
+    commentBody += autoupdateNotice
 
     let createCommentFn, listCommentsFn, updateCommentFn, issueNumberOrSha
     if (isPullRequest) {