## Context
As per PR title, disables disk management for HA projects, which
involves
- Disabling "Increase disk size" CTAs in reports/database and the old
disk config settings in database/settings
- Disabling all input fields related to disk management in
settings/infrastructure
<img width="1076" height="857" alt="image"
src="https://github.com/user-attachments/assets/bfbdfc36-8ae3-41ce-af12-c05b46e620f4"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added High Availability notices and restrictions throughout disk
management settings.
* Disabled disk size, IOPS, throughput, and autoscaling controls where
High Availability limits changes.
* Added explanatory tooltips for restricted disk-size actions.
* Updated database observability controls to reflect High Availability
restrictions.
* **Accessibility**
* Added an accessible label to the database observability refresh
button.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
- Updates connection pooling settings to be read-only when a high
availability project with ip4 admonition removed
- Updates organization usage to be disabled until supported
- Updates database publications to be disabled until supported
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added High Availability handling for database publications, usage, and
connection pooling.
* Publications and usage now display dedicated “unavailable” empty
states and hide gated content when High Availability is enabled.
* Connection pooling switches to managed/read-only mode on High
Availability, disabling edits and form submission and disabling related
data fetching.
* Pooling mode controls are hidden on High Availability.
* **Refactor**
* Refactored database publications pages by extracting main rendering
logic into internal components.
* **Tests**
* Added Vitest + React Testing Library coverage for High Availability
behavior across publications availability, usage, connection pooling,
and pooling modes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Alaister Young <10985857+alaister@users.noreply.github.com>
Joshen Lim