Update observability dashboards tests

[ritvibhatt]

Description

Update traces and services tests to use data-test-subj instead of searching for string "Refresh" to click refresh button
Update notebooks to use just data-test-subj for checking header and updated delete button

Services:

Traces:

Notebooks:

Issues Resolved

[List any issues this PR will resolve]

Check List

• Commits are signed per the DCO using --signoff

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[TackAdam]

LGTM

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-1669-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 57db1eb9a3e4bd72372963a9ceee8c4a153bc13d
# Push it to GitHub
git push --set-upstream origin backport/backport-1669-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-1669-to-2.x.