chore(scripts): build smithy-typescript from specific commit during codegen

[trivikr]

Issue

Internal JS-4624

Description

Add ability to build smithy-typescript codegen from specific commit.

Testing

smithy-typescript directory

The smithy-typescript is checked out in sibling folder

$ aws-sdk-js-v3> rm -rf ~/.m2/repository

$ aws-sdk-js-v3> [ -d ../smithy-typescript ] && echo "Yes" || echo "No"
Yes

$ aws-sdk-js-v3> yarn generate-clients -g codegen/sdk-codegen/aws-models/acm.json -n
...
Done in 18.86s.

$ aws-sdk-js-v3> git status
On branch publish-smithy-ts-before-codegen
Your branch is up to date with 'origin/publish-smithy-ts-before-codegen'.

nothing to commit, working tree clean

The smithy-typescript is not checked out in sibling folder

$ aws-sdk-js-v3> rm -rf ~/.m2/repository

$ aws-sdk-js-v3> [ -d ../smithy-typescript ] && echo "Yes" || echo "No"
No

$ aws-sdk-js-v3> yarn generate-clients -g codegen/sdk-codegen/aws-models/acm.json -n
...
Done in 20.77s.

$ aws-sdk-js-v3> [ -d ../smithy-typescript ] && echo "Yes" || echo "No"
No

$ aws-sdk-js-v3> git status
On branch publish-smithy-ts-before-codegen
Your branch is up to date with 'origin/publish-smithy-ts-before-codegen'.

nothing to commit, working tree clean

Provide specific folder to check out smithy-typescript in

$ aws-sdk-js-v3> rm -rf ~/.m2/repository

$ aws-sdk-js-v3> [ -d ../smithy-ts ] && echo "Yes" || echo "No"
No

$ aws-sdk-js-v3> yarn generate-clients -g codegen/sdk-codegen/aws-models/acm.json -n -r ../smithy-ts
...
Done in 19.68s

$ aws-sdk-js-v3> [ -d ../smithy-ts ] && echo "Yes" || echo "No"
No

$ aws-sdk-js-v3> git status
On branch publish-smithy-ts-before-codegen
Your branch is up to date with 'origin/publish-smithy-ts-before-codegen'.

nothing to commit, working tree clean

smithy-typescript commit

$ aws-sdk-js-v3> yarn generate-clients -g codegen/sdk-codegen/aws-models/acm.json -n -c 8f6e5a31
...
Done in 18.32s.

# Undo changes in https://github.com/awslabs/smithy-typescript/pull/889
$ aws-sdk-js-v3> git status
On branch publish-smithy-ts-before-codegen
Your branch is up to date with 'origin/publish-smithy-ts-before-codegen'.

Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        deleted:    clients/client-acm/src/extensionConfiguration.ts
        modified:   clients/client-acm/src/runtimeExtensions.ts

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        clients/client-acm/src/clientConfiguration.ts

no changes added to commit (use "git add" and/or "git commit -a")

---

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

[syall]

Looks good, found a typo.

[github-actions]

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