Bulk insert returns for all values inserted the same row for Aurora Data API driver

[coyoteecd]

Issue Description

This is a follow-up of #6668 and #5973; there we got a fix for MySQL driver, but not for the Aurora Data API driver (which is based off the MySQL driver). The behavior described there still reproduces with this driver.

Expected Behavior

When bulk-inserting records, e.g. via repository.insert(), the InsertResult should contain all the inserted identifiers in the identifiers array.

Actual Behavior

Only the first identifier is retrieved and the (unnecessary) SELECT done after the INSERT is using the same ID repeated over.

Steps to Reproduce

See #5973, but with Aurora Data API driver.

My Environment

Dependency	Version
Operating System	Windows 10
Node.js version	v12.14.0
Typescript version	v4.1.3
TypeORM version	v0.2.31

Relevant Database Driver(s)

• aurora-data-api
• aurora-data-api-pg
• better-sqlite3
• cockroachdb
• cordova
• expo
• mongodb
• mysql
• nativescript
• oracle
• postgres
• react-native
• sap
• sqlite
• sqlite-abstract
• sqljs
• sqlserver

Are you willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time, and I know how to start.
• Yes, I have the time, but I don't know how to start. I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.