fix: kokoro for macos kokoro/macos/cmake-vcpkg

[jinseopkim0]

• homebrew clean up in ci/kokoro/macos/build.sh is to fix install of bash and ninja.
• homebrew updates for cmake in ci/kokoro/macos/builds/cmake-vcpkg.sh is to fix install of cmake.

---

This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.04%. Comparing base (612245c) to head (53f2c47).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15458   +/-   ##
=======================================
  Coverage   93.04%   93.04%           
=======================================
  Files        2403     2403           
  Lines      219553   219553           
=======================================
+ Hits       204273   204276    +3     
+ Misses      15280    15277    -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[scotthart]

@scotthart reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @jinseopkim0)

[jinseopkim0]

This PR was for b/438767727