bazel: tidy up bin/bazel invocations a bit (#31106)

Wrap the call to `subprocess` in a try-catch so when a Bazel build fails
or is canceled we don't print the Python backtrace.

### Motivation

Makes `bin/bazel` a little nicer.

### Checklist

- [ ] This PR has adequate test coverage / QA involvement has been duly
considered. ([trigger-ci for additional test/nightly
runs](https://trigger-ci.dev.materialize.com/))
- [ ] This PR has an associated up-to-date [design
doc](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/design/README.md),
is a design doc
([template](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/design/00000000_template.md)),
or is sufficiently small to not require a design.
  <!-- Reference the design in the description. -->
- [ ] If this PR evolves [an existing `$T ⇔ Proto$T`
mapping](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/command-and-response-binary-encoding.md)
(possibly in a backwards-incompatible way), then it is tagged with a
`T-proto` label.
- [ ] If this PR will require changes to cloud orchestration or tests,
there is a companion cloud PR to account for those changes that is
tagged with the release-blocker label
([example](MaterializeInc/cloud#5021)).
<!-- Ask in #team-cloud on Slack if you need help preparing the cloud
PR. -->
- [ ] If this PR includes major [user-facing behavior
changes](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/guide-changes.md#what-changes-require-a-release-note),
I have pinged the relevant PM to schedule a changelog post.

misc/python/materialize/cli/bazel.py

@@ -116,7 +116,12 @@ def integrity_cmd(config: BuildConfig, args: list[str]):
 def bazel_cmd(config: BuildConfig, args: list[str]):
     """Forwards all arguments to Bazel, possibly with extra configuration."""
     remote_cache = remote_cache_arg(config)
-    subprocess.run(["bazel", *args, *remote_cache], check=True)
+    try:
+        subprocess.run(["bazel", *args, *remote_cache], check=True)
+    except:
+        # Don't print any python backtrace because it's never useful. Instead
+        # just exit the process.
+        exit(1)
 
 
 def gen(config: BuildConfig, path: Path | None, check: bool):