Alerting: Fix MatcherFilter onChange handling

[konrad147]

What is this feature?
This PR fixes MatcherFilter component

debouce function delays the invocation of the inner function and the event parameter gets changed between the event occurrence and actually calling the function resulting in undefined error

Fixes #82044

Special notes for your reviewer:

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[grafana-delivery-bot]

This PR must be merged before a backport PR will be created.

[grafana-delivery-bot]

This PR must be merged before a backport PR will be created.

[soniaAguilarPeiron]

LGTM!

[grafana-delivery-bot]

The backport to v11.0.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-87511-to-v11.0.x origin/v11.0.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x c203a030e8e6123b9abe5d580ea00a16aa81e0ba

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-87511-to-v11.0.x
# Create the PR body template
PR_BODY=$(gh pr view 87511 --json body --template 'Backport c203a030e8e6123b9abe5d580ea00a16aa81e0ba from #87511{{ "\n\n---\n\n" }}{{ index . "body" }}')
# Create the PR on GitHub
echo "${PR_BODY}" | gh pr create --title "[v11.0.x] Alerting: Fix MatcherFilter onChange handling" --body-file - --label "type/bug" --label "area/alerting" --label "area/frontend" --label "no-changelog" --label "backport" --base v11.0.x --milestone 11.0.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-87511-to-v11.0.x

# Create a pull request where the `base` branch is `v11.0.x` and the `compare`/`head` branch is `backport-87511-to-v11.0.x`.

# Remove the local backport branch
git switch main
git branch -D backport-87511-to-v11.0.x

[konrad147]

No backport needed. v11.0 is not affected