Make region fetching async - fix ENOBUFS error on syncRequest

Description

Background

When running npm run fullBuild, the build would sometimes fail when attempting to fetch AWS regions with the following error:

> ts-node ./build-scripts/generateResources.ts

Fetching AWS regions
Error: spawnSync /usr/local/bin/node ENOBUFS
    at Object.spawnSync (node:internal/child_process:1119:20)
    at spawnSync (node:child_process:847:24)
    at Object.nodeNC [as fastestFunction] (/codebuild/output/src1778635634/src/github.com/aws/aws-toolkit-azure-devops/node_modules/sync-rpc/lib/index.js:96:12)
    at sendMessage (/codebuild/output/src1778635634/src/github.com/aws/aws-toolkit-azure-devops/node_modules/sync-rpc/lib/index.js:118:29)
    at /codebuild/output/src1778635634/src/github.com/aws/aws-toolkit-azure-devops/node_modules/sync-rpc/lib/index.js:159:25
    at Object.request (/codebuild/output/src1778635634/src/github.com/aws/aws-toolkit-azure-devops/node_modules/sync-request/lib/index.js:28:15)
    at fetchLatestRegions (/codebuild/output/src1778635634/src/github.com/aws/aws-toolkit-azure-devops/build-scripts/generateResources.ts:37:28)
    at Object.<anonymous> (/codebuild/output/src1778635634/src/github.com/aws/aws-toolkit-azure-devops/build-scripts/generateResources.ts:211:22)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Module.m._compile (/codebuild/output/src1778635634/src/github.com/aws/aws-toolkit-azure-devops/node_modules/ts-node/src/index.ts:858:23)

Problem

The reason for this error is due to our use of the synchronous syncRequest for making the HTTP fetch request.

Solution

Make region fetching async using axios.get

Testing

Ran tests locally.
Replicated the linux codebuild job in my personal aws account and pointed those to my forked repo to confirm that this runs successfully.

Checklist

[x] I have read the README document
[x] I have read the CONTRIBUTING document
[x] My code follows the code style of this project
[ ] I have added tests to cover my changes
[ ] A short description of the change has been added to the changelog using the script npm run newChange

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

aws / aws-toolkit-azure-devops

Make region fetching async - fix ENOBUFS error on syncRequest #549