docs: update set up workstation how-to

[alevenberg]

• Update doc to handle x86_64 (uname -p produces unknown for x86_64 on my VM)
• Add sudo before running the install google sdk script so the mkdir commands can create directories
• Add a note about installing clangtidy in newer versions of ubuntu

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This change is 

[coryan]

Seems like we should be removing some existing code at the same time?

[coryan]

FYI, we use conventional commits: https://www.conventionalcommits.org/en/v1.0.0/ The title for this PR should be something like:

ci: update script to install gcloud CLI

or

docs: update set up workstation how-to

The fact that both are possible suggests they could be two separate PRs. But for small changes like this mixing two things is not the end of the world.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f2f8665) 93.81% compared to head (6135814) 93.82%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11478   +/-   ##
=======================================
  Coverage   93.81%   93.82%           
=======================================
  Files        1808     1808           
  Lines      163596   163596           
=======================================
+ Hits       153481   153487    +6     
+ Misses      10115    10109    -6     

see 6 files with indirect coverage changes

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[coryan]

Reviewed 2 of 3 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @alevenberg)