Remove deprecated caching components: XCache and ZendDataCache, and update related tests and documentation.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.53%. Comparing base (973a55f) to head (f742b29).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #20541      +/-   ##
============================================
+ Coverage     64.48%   64.53%   +0.04%     
+ Complexity    11571    11555      -16     
============================================
  Files           433      431       -2     
  Lines         37609    37581      -28     
============================================
  Hits          24252    24252              
+ Misses        13357    13329      -28     

☔ 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.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[samdark]

👍