fix(mongodb): remove broken type export V4Connection

The type `V4Connection` re-introduced in open-telemetry#1170 is missing any type
definitions or imports for `Document`, breaking the build with
Typescript strict mode.
`V4Connection` in `types.ts` is not referenced anywhere (the type
definition in `internal-types.ts` is used. So lets just drop this type
definition.

BREAKING CHANGE: removes the broken exported type `V4Connection`.
Fixes open-telemetry#1639

Signed-off-by: Simon Berz <simon@berz.me>

plugins/node/opentelemetry-instrumentation-mongodb/src/types.ts

@@ -69,14 +69,3 @@ export enum MongodbCommandType {
   COUNT = 'count',
   UNKNOWN = 'unknown',
 }
-
-// https://github.com/mongodb/node-mongodb-native/blob/v4.2.2/src/cmap/connection.ts
-export type V4Connection = {
-  id: number | '<monitor>';
-  command(
-    ns: any,
-    cmd: Document,
-    options: undefined | unknown,
-    callback: any
-  ): void;
-};