fix: use fromStatic to return default config values

[trivikr]

Issue #, if available:
Internal JS-1909

Description of changes:
use fromStatic to return default config values

Verified that integration tests no longer throw No max_attempts found for profile default in SDK configuration files error:

On master:

$ yarn test:integration-legacy --tags @acm
yarn run v1.22.4
$ cucumber-js --fail-fast --tags @acm
.(node:5683) UnhandledPromiseRejectionWarning: Error: No max_attempts found for profile default in SDK configuration files
    at new ProviderError (/local/home/trivikr/workspace/aws-sdk-js-v3/packages/property-provider/dist/cjs/ProviderError.js:17:28)
    at /local/home/trivikr/workspace/aws-sdk-js-v3/packages/retry-config-provider/dist/cjs/fromSharedConfigFiles.js:23:27
    at step (/local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/tslib/tslib.js:141:27)
    at Object.next (/local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/tslib/tslib.js:122:57)
    at fulfilled (/local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/tslib/tslib.js:112:62)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:5683) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 7)
(node:5683) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
.(node:5683) PromiseRejectionHandledWarning: Promise rejection was handled asynchronously (rejection id: 7)
....(node:5683) UnhandledPromiseRejectionWarning: Error: No max_attempts found for profile default in SDK configuration files
    at new ProviderError (/local/home/trivikr/workspace/aws-sdk-js-v3/packages/property-provider/dist/cjs/ProviderError.js:17:28)
    at /local/home/trivikr/workspace/aws-sdk-js-v3/packages/retry-config-provider/dist/cjs/fromSharedConfigFiles.js:23:27
    at step (/local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/tslib/tslib.js:141:27)
    at Object.next (/local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/tslib/tslib.js:122:57)
    at fulfilled (/local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/tslib/tslib.js:112:62)
(node:5683) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 14)
.(node:5683) PromiseRejectionHandledWarning: Promise rejection was handled asynchronously (rejection id: 14)
..

2 scenarios (2 passed)
5 steps (5 passed)
0m00.055s
Done in 2.38s.

On PR branch:

$ yarn test:integration-legacy --tags @acm
yarn run v1.22.4
$ cucumber-js --fail-fast --tags @acm
.........

2 scenarios (2 passed)
5 steps (5 passed)
0m00.152s
Done in 2.45s.

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

[codecov-commenter]

Codecov Report

Merging #1341 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1341      +/-   ##
==========================================
+ Coverage   77.67%   77.69%   +0.01%     
==========================================
  Files         286      287       +1     
  Lines       11955    11978      +23     
  Branches     2623     2627       +4     
==========================================
+ Hits         9286     9306      +20     
- Misses       2669     2672       +3     

Impacted Files	Coverage Δ
packages/middleware-retry/src/defaultStrategy.ts	100.00% <100.00%> (ø)
.../middleware-sdk-transcribe-streaming/src/signer.ts	80.00% <100.00%> (ø)
...kages/retry-config-provider/src/defaultProvider.ts	100.00% <100.00%> (ø)

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[AllanZhengYP]

Looks good to me!

[github-actions]

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