Only update UI when there's been a change in conflict detection

[Gold856]

Description

After #1991, the program state was always resent in an attempt to simplify logic, but this had the side effect of causing the settings UI to reset periodically when the hostname check was performed. This restores the original logic in #1791 to check for differences in the conflict state, and to only send the program state if it's changed.

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why
• 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 v2024.3.1
• 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