Auth Emulator: Fails to import users when data size is > 100KB

[mgreenw]

[REQUIRED] Environment info

firebase-tools: 9.16.0

Platform: macOS 11.2.3

[REQUIRED] Test case

Add at least 500 auth users to a fresh hosted firebase project

[REQUIRED] Steps to reproduce

1. Generate test case data
2. Export those users with firebase auth:export accounts.json
3. Start a new firebase emulator with firebase emulators:start --import ./emulators/local --export-on-exit
4. Exit the emulator, and then copy accounts.json to the correct location in the new emulator export (auth_export/accounts.json).
5. Start up the emulator again

[REQUIRED] Expected behavior

The auth emulator to start and import all of the users.

[REQUIRED] Actual behavior

Error: Error during Auth Emulator import: Received HTTP status code: 413
{
  "message": "request entity too large",
  "limit": 100000,
  "received": 126634,
  "type": "entity.too.large"
}
error Command failed with exit code 1.

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[yuchenshi]

Duplicate of #3577.