Run format check in our CI and fix repo format

[celinval]

Changed the check-rustc.sh script to run the format check. Also added a --bless mode to apply the changes locally.
This change also includes the result of running the script with the --bless mode on.

Related to #38

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

[zhassan-aws]

Awesome! What does the error look like when the formatting check fails?

[celinval]

Awesome! What does the error look like when the formatting check fails?

It will contain the diff of the files in the temporary folder, like any rustfmt failure.

[celinval]

I'll solve the merge conflicts after the second review

[zhassan-aws]

Awesome! What does the error look like when the formatting check fails?

It will contain the diff of the files in the temporary folder, like any rustfmt failure.

When it fails, would it be possible for the script to print the command the user should run to format the code?

[tautschnig]

I'll solve the merge conflicts after the second review

I’ll re-approve once conflicts are resolved.

[celinval]

Awesome! What does the error look like when the formatting check fails?

It will contain the diff of the files in the temporary folder, like any rustfmt failure.

When it fails, would it be possible for the script to print the command the user should run to format the code?

Sure... I can do that

[carolynzech]

Putting this PR in draft for now. I don't know what's causing the workflow failures. The failure in 03855ef
for MacOS (about --suffix) I already fixed in dd870e5, but dd870e5's workflow still fails with a bootstrapping error. I can't reproduce that issue locally because my laptop crashes with this error:

panic(cpu 8 caller 0xfffffe0028663d1c): Mutex 0xfffffe1fffe29740 is unexpectedly owned by thread 0xfffffe24dd4f4fd0 @lock_mtx.c:175

before it gets there. (By crashes, I mean my computer reboots--this is a MacOS kernel failure, not a nicely handled script error.) I need to investigate more.

For now, I did update the repo with the result of running ./x fmt, since the script runs fine locally if I use dd870e5 and exit before running ./x test

[carolynzech]

Looks good! These are nits, take or leave them.

[celinval]

Done!