Include access request metadata in app.session.start events

[rudream]

Purpose

This PR resolves #46622

This PR fixes an issue where access request metadata was not included in app.session.start events when an app was launched while assuming an access request.

Before

{
  "app_name": "pgadmin",
  "app_public_addr": "localhost",
  "app_uri": "http://localhost:5050/",
  "cluster_name": "im-a-nodename",
  "code": "T2007I",
  "ei": 0,
  "event": "app.session.start",
  "namespace": "default",
  "public_addr": "localhost",
  "server_id": "59f4906c-d997-4b77-b5cb-0b29346f6469",
  "server_version": "17.0.0-dev",
  "sid": "a501122ed99288081450acd661cbf801e7bd4b3a86244a615898020ffc300056",
  "time": "2024-11-08T09:05:55.206Z",
  "uid": "09b89978-b76c-460d-9e2c-bb2d85b893d4",
  "user": "alice",
  "user_kind": 1
}

After

{
  "access_requests": [
    "01930b05-6315-7c48-944d-33eb23b33400"
  ],
  "app_name": "pgadmin",
  "app_public_addr": "localhost",
  "app_uri": "http://localhost:5050/",
  "cluster_name": "im-a-nodename",
  "code": "T2007I",
  "ei": 0,
  "event": "app.session.start",
  "namespace": "default",
  "public_addr": "localhost",
  "server_id": "59f4906c-d997-4b77-b5cb-0b29346f6469",
  "server_version": "17.0.0-dev",
  "sid": "29288f72a81f763bbd2e64c7babab39dcf4318e8e1a86054ae625b9584c5d28e",
  "time": "2024-11-08T09:10:29.787Z",
  "uid": "037644e2-f658-4a86-ad89-65267d23e380",
  "user": "alice",
  "user_kind": 1
}

changelog: Fix missing access request metadata in app.session.start audit events

[aws-amplify-us-west-2]

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[bl-nero]

Taking Yassine's argument that a proper test would require enormous amount of setup code for little value added, I'm approving this PR.

[public-teleport-github-review-bot]

@rudream See the table below for backport results.

Branch	Result
branch/v16	Create PR
branch/v17	Create PR