[gha] Install eas-cli once in worker workflows

[sjchmiela]

Why

Worker always fails to deploy when we release a new eas-cli version because the latest moves mid-run and NPM reports missing archive for the new version.

How

Replaced npx -y eas-cli@latest ... calls with installing eas-cli globally once and then using eas.

Test plan

Next eas-cli release should deploy worker ok.

[github-actions]

⏩ The changelog entry check has been skipped since the "no changelog" label is present.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.52%. Comparing base (a9d693d) to head (4f8b60c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4203   +/-   ##
=======================================
  Coverage   63.52%   63.52%           
=======================================
  Files        1028     1028           
  Lines       46918    46918           
  Branches     9847     9847           
=======================================
  Hits        29801    29801           
  Misses      17015    17015           
  Partials      102      102           

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