[2.0.0][Distribution]Remove rc1 qualifier reference in your code of 2.0 branch

[peterzhuamazon]

We are coming from this issue: opensearch-project/opensearch-build#2078 in your 2.0 branch.

Note: This needs to be completed before 05/17 which is feature freeze day for 2.0.0-GA.

1. If you have OpenSearch plugin in your repo, make sure your build.gradle remove rc1 reference, leave as "".

opensearch_version = System.getProperty("opensearch.version", "2.0.0-SNAPSHOT")
buildVersionQualifier = System.getProperty("build.version_qualifier", "")

2. If you have OpenSearch-Dashboards plugin in your repo, make sure your package.json remove rc1 reference, leave as 2.0.0.0.

"version": "2.0.0.0",

3. If you have any .github/workflows contains hardcode rc1 reference, please remove.

Thanks.