ci: drop pouchdb-server from test matrix

[alxndrsn]

• pouchdb-server hasn't had an update in 3 years; hasn't had a release in 5 years (https://github.com/pouchdb/pouchdb-server/commits/master/)
• seems to be the blocker for updating the base node version for builds from node v14 (e.g. update ci workflow node environments #8664)
• moving the pouchdb-server build from travis -> github actions and making it pass seems to be non-trivial (https://github.com/alxndrsn/pouchdb-server/actions/runs/8410590833)

[alxndrsn]

Should browser-adapter tests also be dropped?

[garethbowen]

Should browser-adapter tests also be dropped?

Why? Do they hit pouch-server too?

[alxndrsn]

Should browser-adapter tests also be dropped?

Why? Do they hit pouch-server too?

They use pouchdb-express-router. I think I was confused - there are 3 pouch-based servers currently referenced from this repo:

1. pouchdb-server: https://github.com/pouchdb/pouchdb-server
2. pouchdb-express-router: https://github.com/pouchdb/pouchdb-express-router
3. express-pouchdb-minimum: https://github.com/pouchdb/pouchdb-server/tree/master/packages/node_modules/express-pouchdb, via https://github.com/pouchdb/pouchdb/blob/db193f5c1f9f531020f375c0422636948b4c8e5f/tests/misc/express-pouchdb-minimum-for-pouchdb.js

1 & 3 are based on pouchdb-server; #2 seems to be separate.

[alxndrsn]

here's a quick summary of the most recent failures seen on master as per 2024-04-09:

{
  "couchdb-nodejs": {
    "_total_errors": 2,
    "3.1, 16, npm test": 2
  },
  "pouchdb-server": {
    "_total_errors": 17,
    "node, npm test": 12,
    "webkit, npm test": 1,
    "chromium, npm test": 2,
    "firefox, npm test": 2
  },
  "browser-adapter": {
    "_total_errors": 69,
    "chromium, idb, npm test": 1,
    "webkit, idb, npm test": 7,
    "webkit, indexeddb, npm test": 5,
    "webkit, memory, npm test": 16,
    "firefox, idb, npm test": 6,
    "firefox, memory, npm test": 17,
    "firefox, indexeddb, npm test": 16,
    "chromium, indexeddb, npm test": 1
  },
  "nodejs": {
    "_total_errors": 34,
    "16, CLIENT=firefox npm run test-webpack": 18,
    "14, CLIENT=firefox npm run test-webpack": 16
  },
  "nodejs-adapter": {
    "_total_errors": 5,
    "14, memory, npm test": 2,
    "16, leveldb, npm test": 1,
    "16, memory, npm test": 2
  },
  "couchdb-browser": {
    "_total_errors": 1,
    "2.3, webkit, npm test": 1
  }
}

browser-adapter tests run against pouchdb-express-router, not pouchdb-server.

Dropping both of these might be an option, but it's unclear if test flake is actually:

1. in pouch core code
2. in pouch adapter code
3. in pouch test code
4. in server implementations