Fix disk no space issue in bwc-test

[LantaoJin]

Description

The current CI workflow of bwc-tests started 2 clusters with 3 nodes which is easily to fail with no space left:
(now we enabled the build cache in #4646)

Execution failed for task ':integ-test:sqlBwcCluster#rollingUpgradeClusterTask'.
> Failed to copy /home/ci-runner/.gradle/caches/8.14/transforms/1e311199a08f55fdffb433b061421f92/transformed/opensearch-3.4.0-SNAPSHOT-linux-x64.tar.gz/opensearch-3.4.0-SNAPSHOT/lib/lucene-misc-10.3.1.jar to /__w/sql/sql/integ-test/build/testclusters/sqlBwcCluster0-2/distro/3.4.0-ARCHIVE/lib/lucene-misc-10.3.1.jar
> java.io.IOException: No space left on device

This PR separates the workflow of bwc-tests to two workflows:bwc-tests-rolling-upgrade and bwc-tests-full-restart. Each workflow only creates one cluster with 3 nodes.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• New PPL command checklist all confirmed.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff or -s.
• Public documentation issue/PR created.

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[opensearch-trigger-bot]

The backport to 2.19-dev failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/sql/backport-2.19-dev 2.19-dev
# Navigate to the new working tree
pushd ../.worktrees/sql/backport-2.19-dev
# Create a new branch
git switch --create backport/backport-4716-to-2.19-dev
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 a9e5d391a41cf12ed7d1c17d2a29d37f49df7a68
# Push it to GitHub
git push --set-upstream origin backport/backport-4716-to-2.19-dev
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/sql/backport-2.19-dev

Then, create a pull request where the base branch is 2.19-dev and the compare/head branch is backport/backport-4716-to-2.19-dev.