Add warning about arducam-pivariety incompatibility

[tqpcharlie]

Description

Added documentation warning for teams considering Arducam Pivariety cameras to note their incompatibility.

Closes #1363

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why
• This PR has been linted.
• If this PR changes behavior or adds a feature, user documentation is updated
• If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• If this PR touches configuration, this is backwards compatible with settings back to v2025.3.2
• If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• If this PR addresses a bug, a regression test for it is added

[samfreund]

LGTM, but I'd like to confirm that this is still true before we merge it.