[BuildCheck Suggestion]: Batching Copy task invocations

### Summary

We should have a check for calls of the Copy task that are batched, instead of in a single low-overhead parallelizable invocation.

### Background and Motivation

One fairly common antipattern in builds is batching when not necessary. `Copy` is a great example--it can inherently handle most file-copying tasks in a single invocation and uses internal parallelism to copy things quickly, but it's sometimes easier to understand a batched invocation where a single file gets copied. But then you pay a performance cost for that forever.

### Sample issue or antipattern that the check should be flagging

```xml

```

### Sample output

_No response_