Update Firestore Emulator to v1.21.0

[ninjaAB-5]

Description

This PR updates the Firestore Emulator to v1.21.0

Scenarios Tested

$ node lib/bin/firebase.js emulators:start --only firestore
⚠  Could not find config (firebase.json) so using defaults.
i  emulators: Starting emulators: firestore
⚠  firestore: Did not find a Cloud Firestore rules file specified in a firebase.json config file.
⚠  firestore: The emulator will default to allowing all reads and writes. Learn more about this option: https://firebase.google.com/docs/emulator-suite/install_and_configure#security_rules_configuration.
i  firestore: downloading cloud-firestore-emulator-v1.21.0.jar...
Progress: ======================================================================================================================================================================================> (100% of 139MB)
i  firestore: Firestore Emulator logging to firestore-debug.log
✔  firestore: Firestore Emulator was started in standard edition.
✔  firestore: Firestore Emulator UI websocket is running on 9150.
i  ui: downloading ui-v1.15.0.zip...
Progress: ========================================================================================================================================================================================> (100% of 4MB)

┌─────────────────────────────────────────────────────────────┐
│ ✔  All emulators ready! It is now safe to connect your app. │
│ i  View Emulator UI at http://127.0.0.1:4000/               │
└─────────────────────────────────────────────────────────────┘

┌───────────┬────────────────┬─────────────────────────────────┐
│ Emulator  │ Host:Port      │ View in Emulator UI             │
├───────────┼────────────────┼─────────────────────────────────┤
│ Firestore │ 127.0.0.1:8080 │ http://127.0.0.1:4000/firestore │
└───────────┴────────────────┴─────────────────────────────────┘
  Emulator Hub host: 127.0.0.1 port: 4400
  Other reserved ports: 4500, 9150

Issues? Report them at https://github.com/firebase/firebase-tools/issues and attach the *-debug.log files.

[gemini-code-assist]

Code Review

This pull request updates the Firestore Emulator to version 1.21.0, adding support for subqueries and new stages, and allowing database-edition per-database. The CHANGELOG.md has been updated accordingly. However, there is an inconsistency in src/emulator/downloadableEmulatorInfo.json where the version field is set to 1.20.3 while the remoteUrl and downloadPathRelativeToCacheDir correctly point to 1.21.0. This version field should be updated to 1.21.0 for consistency.

[harshyyy21]

Extreme nit, but I noticed that in the "Scenarios Tested" section in the description, there's no line indicating the version of the emulator being used. Is there a way we verify that?

See #10127 for reference, but what I was looking for was something like i firestore: downloading cloud-firestore-emulator-v1.20.4.jar....

[joehan]

Extreme nit, but I noticed that in the "Scenarios Tested" section in the description, there's no line indicating the version of the emulator being used. Is there a way we verify that?

See #10127 for reference, but what I was looking for was something like i firestore: downloading cloud-firestore-emulator-v1.20.4.jar....

That line is only shown the first time you run with a version (since we only download it once and cache). I'm unconcerned since the integration tests are passing on CI (and those would fail if there was a checksum or size mismatch), but if you want to get it again you can rm -rf ~/.cache/firebase/emulators

[ninjaAB-5]

Extreme nit, but I noticed that in the "Scenarios Tested" section in the description, there's no line indicating the version of the emulator being used. Is there a way we verify that?
See #10127 for reference, but what I was looking for was something like i firestore: downloading cloud-firestore-emulator-v1.20.4.jar....

That line is only shown the first time you run with a version (since we only download it once and cache). I'm unconcerned since the integration tests are passing on CI (and those would fail if there was a checksum or size mismatch), but if you want to get it again you can rm -rf ~/.cache/firebase/emulators

That's a good catch! I did run this multiple times, the first time there's a version showed up so I didn't pay a lot of attention afterwards and just copied the output from a latter run... Cleaned the cache and updated the output in the description, thanks both!