Use functional test repo to run maps integration test workflow

[junqiu-lei]

Description

This PR is going to use functional test repo to run maps integration test workflow and remove existing failing CI which uses tests case from this repo. The new CI workflow name is FTR E2E Dashboards Maps Test.

opensearch-dashboards-functional-test repo contains all OpenSearch front end plugins integration tests, which is used for release.

This merged PR opensearch-project/opensearch-dashboards-functional-test#1540 helped to move all existing maps integration test into FTR repo.

Issues Resolved

Closes #592

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[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-664-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 7ecc08431371a67e728315be9a5edb7240054283
# Push it to GitHub
git push --set-upstream origin backport/backport-664-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-664-to-2.x.