ci: add disk GC for E2E jobs

[saintube]

Ⅰ. Describe what this PR does

• Add a disk GC step to free enough spaces to run E2E tests.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.90%. Comparing base (4df8540) to head (904dd50).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2157      +/-   ##
==========================================
+ Coverage   67.87%   67.90%   +0.03%     
==========================================
  Files         443      443              
  Lines       41921    41921              
==========================================
+ Hits        28453    28468      +15     
+ Misses      11013    11001      -12     
+ Partials     2455     2452       -3     

Flag	Coverage Δ
unittests	67.90% <ø> (+0.03%)	⬆️

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[jasonliu747]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jasonliu747

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