Fix `RERUN_FLUSH_NUM_BYTES` and data size estimations #7679

Job	Run time
cpp-paths-filter	6s
Checks / Python lints (ruff, mypy, …)	5m 48s
Checks / Test Python Docs	25s
Checks / Check if running codegen would produce any changes	2m 2s
Checks / Rust lints (fmt, check, cranky, tests, doc)	17m 9s
Checks / Check Rust web build (wasm32 + wasm-bindgen)	2m 43s
Checks / Lint TOML files	14s
Checks / Rerun lints	2m 19s
Checks / Spell Check	4s
Checks / Cargo Deny	2m 16s
Checks / C++ formatting check	3m 25s
Checks / Misc formatting	16s
Minimum Wheel Build / Set Config (linux)	7s
Build JS / Build	6m 25s
Build & Upload rerun_c (Linux x64) / Set Config (linux)	2s
Build & Upload rerun-cli (Linux x64) / Set Config (linux)	2s
Build Web / Build Web (wasm32 + wasm-bindgen)	6m 39s
Update PR Body / Update PR body	1m 54s
Build & Upload rerun-cli (Linux x64) / Build rerun-cli (ubuntu-latest-16-cores)	6m 32s
Build & Upload rerun_c (Linux x64) / Build rerun_c (ubuntu-latest-16-cores)	2m 14s
C++ tests / matrix_prep	3s
C++ tests / C++ build & test - Linux x64	2m 36s
Minimum Wheel Build / Build Wheels (ubuntu-latest-16-cores)	3m 45s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	14s
Bundle and upload rerun_cpp_sdk.zip / Bundle and upload rerun_cpp_sdk.zip	8m 20s
Build Examples / Build Examples	1m 50s
Run Notebook / Run notebook	2m 15s
Minimum Wheel Test / Set Config (linux)	2s
Minimum Wheel Test / Test Wheels (ubuntu-latest-16-cores)	9m 39s
Track Sizes / Track Sizes	41s
Upload Examples / Upload Examples to Google Cloud	17s
Save PR Summary / Create HTML summary for PR	31s
	1h 30m 55s

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