fix: m2m sharing same row

[Weakky]

Overview

fixes prisma/prisma#12206

[Weakky]

We inserted the key/value coerced but did the map lookup without coercing so it wouldn't find the entry after the first insert.

[janpio]

[2022-06-23T16:46:56Z] failures:
[2022-06-23T16:46:56Z]
[2022-06-23T16:46:56Z] ---- queries::simple::m2m::m2m::m2m_sharing_same_row stdout ----
[2022-06-23T16:46:56Z] thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "\u{1b}[1;91merror\u{1b}[0m: \u{1b}[1mError validating field `userId` in model `User`: MongoDB model IDs must have a @map(\"_id\") annotations.\u{1b}[0m\n  \u{1b}[1;94m-->\u{1b}[0m  \u{1b}[4mschema.prisma:14\u{1b}[0m\n\u{1b}[1;94m   | \u{1b}[0m\n\u{1b}[1;94m13 | \u{1b}[0mmodel User {\n\u{1b}[1;94m14 | \u{1b}[0m  \u{1b}[1;91muserId BigInt @id\u{1b}[0m\n\u{1b}[1;94m15 | \u{1b}[0m  tags_ids String[]\n\u{1b}[1;94m   | \u{1b}[0m\n\u{1b}[1;91merror\u{1b}[0m: \u{1b}[1mError validating field `tagId` in model `Tag`: MongoDB model IDs must have a @map(\"_id\") annotations.\u{1b}[0m\n  \u{1b}[1;94m-->\u{1b}[0m  \u{1b}[4mschema.prisma:20\u{1b}[0m\n\u{1b}[1;94m   | \u{1b}[0m\n\u{1b}[1;94m19 | \u{1b}[0mmodel Tag {\n\u{1b}[1;94m20 | \u{1b}[0m  \u{1b}[1;91mtagId String @id @default(uuid())\u{1b}[0m\n\u{1b}[1;94m21 | \u{1b}[0m  name  String\n\u{1b}[1;94m   | \u{1b}[0m\n"', /root/build/migration-engine/qe-setup/src/mongodb.rs:19:66
[2022-06-23T16:46:56Z] stack backtrace:
[2022-06-23T16:46:56Z]    0: rust_begin_unwind
[2022-06-23T16:46:56Z]              at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/std/src/panicking.rs:584:5
[2022-06-23T16:46:56Z]    1: core::panicking::panic_fmt
[2022-06-23T16:46:56Z]              at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/panicking.rs:143:14
[2022-06-23T16:46:56Z]    2: core::result::unwrap_failed

I think the schema needs a special case for the MongoDB id.