Right-size macOS PR runners (#64923)

## Summary

- add the 6 vCPU / 14 GB Namespace mac-small runner to workflow
generation
- use it for all macOS clippy jobs, visual-test binary compilation, and
run_tests remote-server checks
- keep macOS tests, bundles, and other release jobs on mac-large

The matching mac-small Namespace profile is already configured with the
same Sequoia image and cache settings as mac-large.

## Testing

- cargo test -p xtask
- cargo xtask workflows
- actionlint -color
- git diff --check

Release Notes:

- N/A

---------

Co-authored-by: Amp <amp@ampcode.com>

.github/actionlint.yml

@@ -32,6 +32,7 @@ self-hosted-runner:
     - namespace-profile-8x32-ubuntu-2004-arm-m4
     # Namespace mac
     - namespace-profile-mac-large
+    - namespace-profile-mac-small
     # Self Hosted Runners
     - self-mini-macos
     - self-32vcpu-windows-2022

.github/workflows/release.yml

@@ -164,7 +164,7 @@ jobs:
     timeout-minutes: 60
   clippy_mac:
     if: (github.repository_owner == 'zed-industries' || github.repository_owner == 'zed-extensions')
-    runs-on: namespace-profile-mac-large
+    runs-on: namespace-profile-mac-small
     steps:
     - name: steps::checkout_repo
       uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd

.github/workflows/run_tests.yml

@@ -265,7 +265,7 @@ jobs:
     - orchestrate
     - check_style
     if: needs.orchestrate.outputs.run_tests == 'true' && github.event_name != 'merge_group'
-    runs-on: namespace-profile-mac-large
+    runs-on: namespace-profile-mac-small
     steps:
     - name: steps::checkout_repo
       uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
@@ -297,7 +297,7 @@ jobs:
     - orchestrate
     - check_style
     if: needs.orchestrate.outputs.run_tests == 'true' && github.event_name != 'merge_group'
-    runs-on: namespace-profile-mac-large
+    runs-on: namespace-profile-mac-small
     steps:
     - name: steps::checkout_repo
       uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
@@ -628,7 +628,7 @@ jobs:
     - orchestrate
     - check_style
     if: needs.orchestrate.outputs.run_tests == 'true' && github.event_name != 'merge_group'
-    runs-on: namespace-profile-mac-large
+    runs-on: namespace-profile-mac-small
     steps:
     - name: steps::checkout_repo
       uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
@@ -906,7 +906,7 @@ jobs:
     - orchestrate
     - check_style
     if: needs.orchestrate.outputs.run_tests == 'true' && github.event_name != 'merge_group'
-    runs-on: namespace-profile-mac-large
+    runs-on: namespace-profile-mac-small
     steps:
     - name: steps::checkout_repo
       uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd

tooling/xtask/src/tasks/workflows/run_tests.rs

@@ -545,7 +545,7 @@ fn check_remote_server(platform: Platform, arch: Arch) -> NamedJob {
     let runner = match (platform, arch) {
         (Platform::Linux, Arch::X86_64) => runners::LINUX_LARGE,
         (Platform::Linux, Arch::AARCH64) => runners::LINUX_ARM_BUNDLER,
-        (Platform::Mac, _) => runners::MAC_DEFAULT,
+        (Platform::Mac, _) => runners::MAC_SMALL,
         (Platform::Windows, _) => runners::WINDOWS_DEFAULT,
     };
     let command = format!(
@@ -628,7 +628,7 @@ pub(crate) fn clippy(platform: Platform, arch: Option<Arch>, harden: bool) -> Na
     let runner = match platform {
         Platform::Windows => runners::WINDOWS_DEFAULT,
         Platform::Linux => runners::LINUX_DEFAULT,
-        Platform::Mac => runners::MAC_DEFAULT,
+        Platform::Mac => runners::MAC_SMALL,
     };
     let mut job = release_job(&[])
         .runs_on(runner)
@@ -741,7 +741,7 @@ fn build_visual_tests_binary() -> NamedJob {
 
     named::job(
         Job::default()
-            .runs_on(runners::MAC_DEFAULT)
+            .runs_on(runners::MAC_SMALL)
             .add_step(steps::checkout_repo())
             .add_step(steps::setup_cargo_config(Platform::Mac))
             .add_step(steps::cache_rust_dependencies_namespace())

tooling/xtask/src/tasks/workflows/runners.rs

@@ -14,6 +14,7 @@ pub const LINUX_ARM_BUNDLER: Runner = Runner("namespace-profile-8x32-ubuntu-2004
 pub const LINUX_LARGE_RAM: Runner = Runner("namespace-profile-8x32-ubuntu-2404");
 
 pub const MAC_DEFAULT: Runner = Runner("namespace-profile-mac-large");
+pub const MAC_SMALL: Runner = Runner("namespace-profile-mac-small");
 pub const WINDOWS_DEFAULT: Runner = Runner("self-32vcpu-windows-2022");
 
 pub struct Runner(&'static str);