Alerting: Show panels within collapsed rows in dashboard picker

[VikaCep]

What is this feature?

Currently, when creating an alert rule and linking it to a dashboard and panel, the picker is not showing panels within collapsed rows. Additionally, it's listing rows as panels. This PR fixes that by allowing to choose from panels that are within collapsed rows and also filters out rows from the modal.

Why do we need this feature?

To be able to select panels within collapsed rows.

Who is this feature for?

All users

Which issue(s) does this PR fix?:

Fixes #75093

[grafana-delivery-bot]

Hello @VikaCep!
Backport pull requests need to be either:

• Pull requests which address bugs,
• Urgent fixes which need product approval, in order to get merged,
• Docs changes.

Please, if the current pull request addresses a bug fix, label it with the type/bug label.
If it already has the product approval, please add the product-approved label. For docs changes, please add the type/docs label.
If the pull request modifies CI behaviour, please add the type/ci label.
If none of the above applies, please consider removing the backport label and target the next major/minor release.
Thanks!

[soniaAguilarPeiron]

LGTM!

[grafana-delivery-bot]

The backport to v10.1.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 branch
git switch --create backport-75490-to-v10.1.x origin/v10.1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 14e94d663fdca4f90883cc9864bedd3719f04e88
# When the conflicts are resolved, stage and commit the changes
git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-75490-to-v10.1.x
# Create the PR body template
PR_BODY=$(gh pr view 75490 --json body --template 'Backport 14e94d663fdca4f90883cc9864bedd3719f04e88 from #75490{{ "\n\n---\n\n" }}{{ index . "body" }}')
# Create the PR on GitHub
echo "${PR_BODY}" | gh pr create --title "[v10.1.x] Alerting: Show panels within collapsed rows in dashboard picker" --body-file - --label "type/bug" --label "area/alerting" --label "area/frontend" --label "add to changelog" --label "backport" --base v10.1.x --milestone 10.1.x --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-75490-to-v10.1.x

# Create a pull request where the `base` branch is `v10.1.x` and the `compare`/`head` branch is `backport-75490-to-v10.1.x`.

# Remove the local backport branch
git switch main
git branch -D backport-75490-to-v10.1.x