Add region warning for emulated database functions

[colerogers]

• Add warning if the function region does not match a database region. Right now, databases are only in us-central1, so any function not in that region should show this warning for better devx.

[codecov-commenter]

Codecov Report

Base: 56.27% // Head: 56.26% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (e495bd6) compared to base (e984a6c).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5143      +/-   ##
==========================================
- Coverage   56.27%   56.26%   -0.01%     
==========================================
  Files         309      309              
  Lines       20820    20822       +2     
  Branches     4224     4225       +1     
==========================================
  Hits        11716    11716              
- Misses       8092     8094       +2     
  Partials     1012     1012              

Impacted Files	Coverage Δ
src/emulator/functionsEmulator.ts	7.06% <0.00%> (-0.03%)	⬇️

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[taeold]

Let's a changelog entry. Seems like this might surprise/break some user.