Update API Gateway tagging to use partition for deployed region

[maafk]

What did you implement

Updated the section for adding tags to API gateway resources to use whatever partition the user is deploying from, rather than only checking whether commercial or govcloud

Closes #6925

How can we verify it

provider:
  name: aws
  stage: ${opt:stage, 'dev'}
  region: cn-northwest-1
  memorySize: 128
  timeout: 15
  # ...
  tags:
    foo: 'bar'

functions:
  hello-world:
    handler: functions/hello-world.handler
    runtime: nodejs10.x
    endpointType: regional
    events:
      - http:
          path: /
          method: GET
          cors: true

Todos

Useful Scripts

• npm run test-ci --> Run all validation checks on proposed changes
• npm run lint-updated --> Lint all the updated files
• npm run lint:fix --> Automatically fix lint problems (if possible)
• npm run prettier-check-updated --> Check if updated files adhere to Prettier config
• npm run prettify-updated --> Prettify all the updated files

• Write and run all tests
• Write documentation
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[codecov-io]

Codecov Report

Merging #6948 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #6948   +/-   ##
=======================================
  Coverage   88.46%   88.46%           
=======================================
  Files         229      229           
  Lines        8394     8394           
=======================================
  Hits         7426     7426           
  Misses        968      968

Impacted Files	Coverage Δ
.../compile/events/apiGateway/lib/hack/updateStage.js	96.42% <100%> (ø)	⬆️

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[medikoo]

Looks great @maafk! Thank you

[ghost]

Amazing @maafk, thank you very much!