Allow S3 uploading of index.yml file besides builds/dist

[tianleh]

Is your feature request related to a problem? Please describe

While working on supporting latest in url, we are following the suggestion to #1569 (comment) to upload an index.yml file which contains the latest build number.

However, as documented in #1569 (comment), we identify that there is AmazonS3Exception when uploading index.yml file. Looks like the IAM role opensearch-bundle is not allowed to perform such uploading. The complete log is in this Jenkins run http://jenki-jenki-fpgmrv2ryxko-1366042710.us-east-1.elb.amazonaws.com/job/Playground/job/tianleh-distribution-url-latest/7/console

Describe the solution you'd like

Allow opensearch-bundle to upload index.yml file under $BUCKET/distribution-build-opensearch/1.2.4

Describe alternatives you've considered

No response

Additional context

No response

[tianleh]

@peternied Could infra team help prioritize this while I am working on #1569?

CC @dblock @seraphjiang @bbarani @xinlamzn for visibility

[dblock]

@tianleh I believe this should be added to https://github.com/opensearch-project/opensearch-build/blob/main/deployment/lib/identities.ts#L40 as needed

[tianleh]

Decided to use index.json instead of index.yml #1569 (comment)