[CI/CD] Add single version flag during bootstrap to fix version conflicts and update the snapshots

[RyanL1997]

Description

• On behalf of the change in dashboards core: [PM] Enhance single version requirements imposed during bootstrapping OpenSearch-Dashboards#5675. We need to add --single-version=loose flag during the bootstrap step in our CI to manipulate the behavior of single-version validation.
• Fix the snapshot mismatch with upstream

Issues Resolved

• Resolve the CI failure: https://github.com/opensearch-project/dashboards-observability/actions/runs/7964135017/job/21741091909?pr=1447#step:16:231

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[derek-ho]

Thanks

[RyanL1997]

@mengweieric @ps48 Should we merge this one? Seems like the failure is irrelevant from the bootstrap issue.

[RyanL1997]

Just double check with @joshuali925 , and it seems like the build failure of snapshot is related to an upstream change. And we are trying to add the fix into this PR too.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (29e1b42) 54.68% compared to head (281e763) 56.55%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1454      +/-   ##
==========================================
+ Coverage   54.68%   56.55%   +1.87%     
==========================================
  Files         317      320       +3     
  Lines       11373    11720     +347     
  Branches     3028     3042      +14     
==========================================
+ Hits         6219     6628     +409     
+ Misses       5103     5040      -63     
- Partials       51       52       +1     

Flag	Coverage Δ
dashboards-observability	56.55% <ø> (+1.87%)	⬆️

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[opensearch-trigger-bot]

The backport to 2.x 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/dashboards-observability/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/dashboards-observability/backport-2.x
# Create a new branch
git switch --create backport/backport-1454-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 7e2d951fef1b639160ec10102496bd6c36349242
# Push it to GitHub
git push --set-upstream origin backport/backport-1454-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/dashboards-observability/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-1454-to-2.x.