fix(mongo-db): pass region when creating or restoring instances

[jremy42]

close #3461

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.76%. Comparing base (5c63523) to head (556d597).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/services/mongodb/instance.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3462      +/-   ##
=========================================
- Coverage    1.76%   1.76%   -0.01%     
=========================================
  Files         401     401              
  Lines       44082   44084       +2     
=========================================
  Hits          779     779              
- Misses      43216   43218       +2     
  Partials       87      87              

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