test: check contextify contextual store behavior in strict mode

[Renegade334]

Previously, this behaviour was tested indirectly by the REPL tests. However, REPL now uses DONT_CONTEXTIFY for its VM context, so the interceptor behaviour is no longer covered.

Refs: #61898 (comment)
Refs: #62371

[targos]

Is this going to block the V8 update if it lands before it?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.72%. Comparing base (b411f90) to head (0913a15).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62571      +/-   ##
==========================================
+ Coverage   89.71%   89.72%   +0.01%     
==========================================
  Files         695      695              
  Lines      214434   214434              
  Branches    41062    41067       +5     
==========================================
+ Hits       192371   192397      +26     
+ Misses      14124    14116       -8     
+ Partials     7939     7921      -18     

see 36 files with indirect coverage changes

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[legendecas]

Yes, we should wait until https://crrev.com/c/7718821 been cherry-picked to #61898 before landing this.

[legendecas]

Test LGTM.