Name the toolbox workflow Toolbox Updater

[jcant0n]

One line: name: Toolbox update → name: Toolbox Updater.

The fleet dashboard picks out agent runs by exact workflow name:

AGENT_WORKFLOWS = {"CI Doctor", "Binding Updater", "Toolbox Updater"}
...
agent_runs = [r for r in runs if r["name"] in AGENT_WORKFLOWS]

so this repository's toolbox runs were never counted. Nothing failed and nothing warned — the
runs simply did not appear, which is the same silent gap the comment next to Vuforia.NET in
that file records.

Every other repository in the fleet already says Toolbox Updater. Checked all eleven that
have the workflow, along with CI Doctor, Binding Updater, CI, CD and Sync standards:
this is the only name that diverges anywhere, and it reached Cesium.NET by being copied from
here.

The workflow is keyed by file path, so its run history survives the rename. But each run
records the name it had at the time, so the dashboard starts counting this repository from the
next Monday on, not retroactively.

[github-actions]

API gate: additive

Every symbol that existed still exists, unchanged. Nothing that compiled before stops compiling.

Target framework	Added	Removed
net10.0-ios	+0	-0
net10.0	+0	-0

_{Enum and constant values are part of the measured surface: a renumbering keeps compiling and sends the wrong number to the driver, so it counts as a removal.}