Use gh workflow for tests (#41384)

Follow up for: #41304

Splits CI tests (cherry-picks and PRs only for now) into separate
workflows using `gh-workflow`. Includes a couple restructures to
- run more things in parallel
- remove our previous shell script based checking to filter tests based
on files changed, instead using the builtin `paths:` workflow filters


Splitting the docs/style/rust tests & checks into separate workflows
means we lose the complete summary showing all the tests in one view,
but it's possible to re-add in the future if we go back to checking what
files changed ourselves or always run everything.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Conrad <conrad@zed.dev>

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

@@ -1,5 +1,5 @@
 use crate::tasks::workflows::{
-    steps::named,
+    steps::{FluentBuilder, named},
     vars::{mac_bundle_envs, windows_bundle_envs},
 };
 
@@ -76,16 +76,12 @@ fn bundle_linux(arch: runners::Arch) -> Job {
         vars::GITHUB_SHA,
         arch.triple()
     );
-    let mut job = bundle_job()
+    bundle_job()
         .runs_on(arch.linux_bundler())
         .add_step(steps::checkout_repo())
         .add_step(steps::setup_sentry())
-        .add_step(steps::script("./script/linux"));
-    // todo(ci) can we do this on arm too?
-    if arch == runners::Arch::X86_64 {
-        job = job.add_step(steps::script("./script/install-mold"));
-    }
-    job.add_step(steps::script("./script/bundle-linux"))
+        .map(steps::install_linux_dependencies)
+        .add_step(steps::script("./script/bundle-linux"))
         .add_step(steps::upload_artifact(
             &artifact_name,
             "target/release/zed-*.tar.gz",