Use vtbackup in scheduled backups

[frouioui]

This Pull Request brings the changes made in planetscale/vitess-operator#658 to the Vitess' examples. The operator manifest has changed with the new CRD definition, and the 101 through 306 steps now include a backup location.

[vitess-bot]

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[GuptaManan100]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.57%. Comparing base (cfd4d29) to head (7f54af0).
Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17869      +/-   ##
==========================================
+ Coverage   67.46%   67.57%   +0.10%     
==========================================
  Files        1594     1597       +3     
  Lines      258984   259780     +796     
==========================================
+ Hits       174717   175535     +818     
+ Misses      84267    84245      -22     

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