fix(amplify-frontend-javascript): geo region default

[phani-srikar]

Description of changes

The Geo resources created before CLI v6.3.1 do not have the Region CFN output. Instead, the project region is used in aws-exports file. The Geo resources created post CLI v6.3.1 however, have Region output which is used in aws-exports. This change fixes the issue #8538 where a customer upgrades the CLI version to v6.3.1 with some Geo resources already present in the project.

Issue #, if available

#8538

Description of how you validated changes

Unit testing; JS sample app

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #8552 (90eb7e4) into master (02894dc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8552   +/-   ##
=======================================
  Coverage   57.14%   57.14%           
=======================================
  Files         724      724           
  Lines       40845    40845           
  Branches     8360     8360           
=======================================
  Hits        23342    23342           
  Misses      16693    16693           
  Partials      810      810           

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