Make pg_version and build_type regular parameters (#4311)

## Problem

All tests have already been parametrised by Postgres version and build
type (to have them distinguishable in the Allure report), but despite
it, it's anyway required to have DEFAULT_PG_VERSION and BUILD_TYPE env
vars set to corresponding values, for example to
run`test_timeline_deletion_with_files_stuck_in_upload_queue[release-pg14-local_fs]`
test it's required to set `DEFAULT_PG_VERSION=14` and
`BUILD_TYPE=release`.
This PR makes the test framework pick up parameters from the test name
itself.

## Summary of changes
- Postgres version and build type related fixtures now are
function-scoped (instead of being sessions scoped before)
- Deprecate `--pg-version` argument in favour of DEFAULT_PG_VERSION env
variable (it's easier to parse)
- GitHub autocomment now includes only one command with all the failed
tests + runs them in parallel

scripts/comment-test-report.js

@@ -144,17 +144,24 @@ const reportSummary = async (params) => {
                 }
                 summary += `- \`${testName}\`: ${links.join(", ")}\n`
             }
-
-            const testsToRerun = Object.values(failedTests[pgVersion]).map(x => x[0].name)
-            const command = `DEFAULT_PG_VERSION=${pgVersion} scripts/pytest -k "${testsToRerun.join(" or ")}"`
-
-            summary += "```\n"
-            summary += `# Run failed on Postgres ${pgVersion} tests locally:\n`
-            summary += `${command}\n`
-            summary += "```\n"
         }
     }
 
+    if (failedTestsCount > 0) {
+        const testsToRerun = []
+        for (const pgVersion of Object.keys(failedTests)) {
+            for (const testName of Object.keys(failedTests[pgVersion])) {
+                testsToRerun.push(...failedTests[pgVersion][testName].map(test => test.name))
+            }
+        }
+        const command = `scripts/pytest -vv -n $(nproc) -k "${testsToRerun.join(" or ")}"`
+
+        summary += "```\n"
+        summary += `# Run all failed tests locally:\n`
+        summary += `${command}\n`
+        summary += "```\n"
+    }
+
     if (flakyTestsCount > 0) {
         summary += `<details>\n<summary>Flaky tests (${flakyTestsCount})</summary>\n\n`
         for (const pgVersion of Array.from(pgVersions).sort().reverse()) {
@@ -164,8 +171,7 @@ const reportSummary = async (params) => {
                     const links = []
                     for (const test of tests) {
                         const allureLink = `${reportUrl}#suites/${test.parentUid}/${test.uid}/retries`
-                        const status = test.status === "passed" ? ":white_check_mark:" : ":x:"
-                        links.push(`[${status} ${test.buildType}](${allureLink})`)
+                        links.push(`[${test.buildType}](${allureLink})`)
                     }
                     summary += `- \`${testName}\`: ${links.join(", ")}\n`
                 }