Use merge table in the dashboard; add Cloud overview to the system table

[alexey-milovidov]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

The dashboard will display metrics across different ClickHouse versions even if the structure of system tables has changed after the upgrade.

[robot-clickhouse-ci-1]

This is an automated comment for commit 7b3e57e with description of existing statuses. It's updated for the latest CI running

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[alexey-milovidov]

Note: when resolving the conflict with the private repository, also change "overview" to "Cloud overview" in the dashboard.html.

[nikitamikhaylov]

Can you please also add a dashboard with ProfileEvent_MergedRows?