CI(pg-clients): unify workflow with build-and-test (#8160)

## Problem

`pg-clients` workflow looks different from the main `build-and-test`
workflow for historical reasons (it was my very first task at Neon, and 
back then I wasn't really familiar with the rest of the CI pipelines).
This PR unifies `pg-clients` workflow with `build-and-test`

## Summary of changes
- Rename `pg_clients.yml` to `pg-clients.yml`
- Run the workflow on changes in relevant files
- Create Allure report for tests
- Send slack notifications to `#on-call-qa-staging-stream` channel
(instead of `#on-call-staging-stream`)
- Update Client libraries once we're here

test_runner/pg_clients/swift/PostgresNIOExample/Dockerfile

@@ -1,10 +1,10 @@
-FROM swift:5.9 AS build
+FROM swift:5.10 AS build
 WORKDIR /source
 
 COPY . .
 RUN swift build --configuration release
 
-FROM swift:5.9
+FROM swift:5.10
 WORKDIR /app
 COPY --from=build /source/.build/release .
 CMD ["/app/PostgresNIOExample"]

test_runner/pg_clients/swift/PostgresNIOExample/Package.resolved

@@ -1,12 +1,22 @@
 {
+  "originHash" : "11b5dcece349a3e56a7a9a7d0af6d0f5b83dff321b43124a01b158ed7aac5302",
   "pins" : [
     {
       "identity" : "postgres-nio",
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/vapor/postgres-nio.git",
       "state" : {
-        "revision" : "69ccfdf4c80144d845e3b439961b7ec6cd7ae33f",
-        "version" : "1.20.2"
+        "revision" : "5c268768890b062803a49f1358becc478f954265",
+        "version" : "1.21.5"
+      }
+    },
+    {
+      "identity" : "swift-async-algorithms",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-async-algorithms.git",
+      "state" : {
+        "revision" : "da4e36f86544cdf733a40d59b3a2267e3a7bbf36",
+        "version" : "1.0.0"
       }
     },
     {
@@ -81,6 +91,15 @@
         "version" : "1.20.1"
       }
     },
+    {
+      "identity" : "swift-service-lifecycle",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swift-server/swift-service-lifecycle.git",
+      "state" : {
+        "revision" : "d58e6bf2b1ae2884cf204a8b5bcaaa7aae3c1ff0",
+        "version" : "2.6.0"
+      }
+    },
     {
       "identity" : "swift-system",
       "kind" : "remoteSourceControl",
@@ -91,5 +110,5 @@
       }
     }
   ],
-  "version" : 2
+  "version" : 3
 }

test_runner/pg_clients/swift/PostgresNIOExample/Package.swift

@@ -1,10 +1,10 @@
-// swift-tools-version:5.9
+// swift-tools-version:5.10
 import PackageDescription
 
 let package = Package(
     name: "PostgresNIOExample",
     dependencies: [
-        .package(url: "https://github.com/vapor/postgres-nio.git", from: "1.20.2")
+        .package(url: "https://github.com/vapor/postgres-nio.git", from: "1.21.5")
     ],
     targets: [
         .executableTarget(