[storage_management] Update Summary dashboard to latest version (DataDog#23284)

* [storage_management] Update Summary dashboard to latest version

- Add $aws_account filter to all bucket-level metric queries
- Remove optimization opportunities and cost & growth widget groups
- Update treemap widget title and query (Needs S3 Inventory)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [storage_management] Add bucket context links to Summary dashboard

Add custom_links to Storage by Bucket, Objects by Bucket, Storage by
Tier and Bucket, and the treemap widget so clicking a bucket opens its
side panel in Storage Management.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [storage_management] Add $aws_account filter to cost widget queries

The Est. Monthly Cost widget was missing $aws_account from all storage
type queries, causing cost to aggregate across all accounts even when
an account filter was applied — inconsistent with the other widgets.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [storage_management] Add MoM comparison to Total Storage, Objects, and Cost widgets

Add a calendar_shift(-1mo) formula as the comparison baseline for the
three summary query_value widgets so Datadog renders each with a
change indicator relative to the same period last month.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [storage_management] Update Summary dashboard to latest exported version

- Replace calendar_shift second-formula approach with native comparison
  field (type: both, previous_timeframe, decrease_better) for Total
  Storage, Total Objects, and Est. Monthly Cost widgets
- Remove Total Buckets widget from top row; resize remaining three to
  width 4 each
- All previous changes preserved: $aws_account filters, context links

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [storage_management] Remove unsupported pause_auto_refresh from Summary dashboard

The field was added by the Datadog UI export but is not allowed by the
dashboard validation schema.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: rmshree