Use `jiff` date-time crate

[NiharP31]

Related

• Closes #9317 (Most of the migrations are done)
• Implements TODO: Migrate from time and chrono to jiff when upgrading to pyo3 0.24

What

This PR migrates our time libraries from time and chrono to jiff, standardizing on a single time library throughout the codebase. The primary changes include:

• Removed direct dependencies on time and chrono from Cargo.toml files
• Added jiff as a dependency in the necessary crates
• Migrated timestamp functionality in re_ui/notifications.rs to use jiff's API
• Updated timestamp serialization and formatting in analytics components
• Modified Python bindings to use jiff instead of chrono for timestamps
• Added tests to verify the correctness of the migration

This change simplifies our dependency tree and resolves the TODO comment in the root Cargo.toml. Note that a subsequent PR will update cargo.deny rules to ban both time and chrono crates to prevent future usage.

Pending

• Cargo.deny - Based on this feedback, I will update this file
• ./Cargo.toml - added jiff version; I haven't erased chrono/time original dependencies
• web-time - Needs confirmation if this needs migration or not

[NiharP31]

@Wumpf. I've migrated files from time and chrono to jiff. I added comments at the end of PR. Can you check them and let me know if any improvements are needed.

[emilk]

Is this blocked by something? Do you need help getting it finnished?

[NiharP31]

@emilk, recovered from health issues. Just need to sort the wasm js. Will push it soon

[Wumpf]

@NiharP31 hope your recovery continued well! Are you still interesting in finishing this up or should someone else take over?

[Wumpf]

Seems abandoned. I'll look into wrapping it up