[ty] Run mypy_primer and typing-conformance workflows on fewer PRs (#22096)

## Summary

Fixes https://github.com/astral-sh/ty/issues/2090. Quoting my rationale
from that issue:

> A PR that only touches code in [one of these crates] should never have
any impact on memory usage or diagnostics produced. And the comments
from the bot just lead to additional notifications which is annoying.

I _think_ I've got the syntax right here. The
[docs](https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax)
say:

>  The order that you define paths patterns matters:
>
> - A matching negative pattern (prefixed with !) after a positive match
will exclude the path.
> - A matching positive pattern after a negative match will include the
path again.

## Test Plan

No idea? Merge it and see?

.github/workflows/mypy_primer.yaml

@@ -6,6 +6,11 @@ on:
   pull_request:
     paths:
       - "crates/ty*/**"
+      - "!crates/ty_ide/**"
+      - "!crates/ty_server/**"
+      - "!crates/ty_test/**"
+      - "!crates/ty_completion_eval/**"
+      - "!crates/ty_wasm/**"
       - "crates/ruff_db"
       - "crates/ruff_python_ast"
       - "crates/ruff_python_parser"

.github/workflows/typing_conformance.yaml

@@ -6,6 +6,11 @@ on:
   pull_request:
     paths:
       - "crates/ty*/**"
+      - "!crates/ty_ide/**"
+      - "!crates/ty_server/**"
+      - "!crates/ty_test/**"
+      - "!crates/ty_completion_eval/**"
+      - "!crates/ty_wasm/**"
       - "crates/ruff_db"
       - "crates/ruff_python_ast"
       - "crates/ruff_python_parser"