fix: start ephemeral timer when chat is archived #17494

Job	Run time
Lint Rust	2m 42s
Build C library (ubuntu-latest)	2m 25s
cargo deny	31s
Build C library (macos-latest)	2m 30s
Rust doc comments	14s
Check if node constants are up to date	3s
Check provider database	4s
Python lint	12s
Build deltachat-rpc-server (ubuntu-latest)	1m 59s
Rust tests (ubuntu-latest, 1.83.0)	1m 32s
Build deltachat-rpc-server (macos-latest)	1m 59s
Rust tests (windows-latest, 1.83.0)	1m 26s
Build deltachat-rpc-server (windows-latest)	4m 41s
Rust tests (macos-latest, 1.83.0)	58s
Rust tests (ubuntu-latest, 1.77.0)	2m 32s
CFFI Python tests (ubuntu-latest, 3.13)	2m 57s
CFFI Python tests (macos-latest, 3.13)	2m 2s
CFFI Python tests (ubuntu-latest, pypy3.10)	2m 46s
CFFI Python tests (macos-latest, pypy3.10)	2m 57s
CFFI Python tests (ubuntu-latest, 3.7)	2m 57s
JSON-RPC Python tests	1s
	37m 28s

Provide feedback