Add HA monitoring

[as51340]

Release note

Added a chapter about the observability in HA.

Related product PRs

PRs from product repo this doc page is related to:
memgraph/memgraph#2772
memgraph/memgraph#2802
memgraph/prometheus-exporter#19
memgraph/prometheus-exporter#20

Checklist:

• Add appropriate milestone (current release cycle)
• Add bugfix or feature label, based on the product PR type you're documenting
• Make sure all relevant tech details are documented
  • Update reference pages (e.g. clauses, functions, flags, experimental, monitoring, Cypher differences)
  • Search for the feature you are working on (mentions) and make updates if needed
  • Provide a basic example of usage
  • In case your feature is an Enterprise one, list it under ME page and mark its page with Enterprise (example).
• Check all content with Grammarly
• Perform a self-review of my code
• The build passes locally
• My changes generate no new warnings or errors

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[katarinasupe]

@as51340 I converted this PR to draft as it's related to product PRs not yet merged. Please mark it as "Read for review"/Open, once your PRs get merged.

[as51340]

it can be merged. Only one PR on exporter isn't merged but that's totally irrelevant, consider it as small bugfix