Free disk space on publish and fix examples tests

[blampe]

I noticed the publish-provider step is running out of disk space, so this frees up disk as part of that.

I had also forgotten the step to fetch ESC secrets when testing examples, so this fixes that,

Fixes #4309.
Fixes #4310.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.67%. Comparing base (12e01d0) to head (a69e1a8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4324      +/-   ##
==========================================
- Coverage   59.70%   59.67%   -0.03%     
==========================================
  Files          90       90              
  Lines       14141    14141              
==========================================
- Hits         8443     8439       -4     
- Misses       5041     5044       +3     
- Partials      657      658       +1     

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[pulumi-bot]

This PR has been shipped in release v3.10.0.