fix(ci): documentation generation on on-release.yml workflow

[ijemmy]

Description of your changes

• Limit concurrency of "publish" job to just one to avoid concurrency issue (Issue: Docs: on-release.yml fails to publish doc when running concurrently #365)
• Generate "latest" alias doc instead of just redirect to the latest version (Issue: Docs: No "latest" path in our doc #367)
• Generate main version

How to verify this change

I've run this workflow in a feature branch. You can verify output in this site: https://awslabs.github.io/aws-lambda-powertools-typescript/latest/

Related issues, RFCs

#365
#367

PR status

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

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• The code coverage hasn't decreased
• I have added tests that prove my change is effective and works
• New and existing unit tests pass locally and in Github Actions
• Any dependent changes have been merged and published in downstream module
• The PR title follows the conventional commit semantics

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[saragerion]

Nice!