Telemetry: Check if otel-cli exists before calling it

[bdice]

shared-actions/telemetry-impls/ensure-otel-cli-available/action.yml

Line 16 in 30afe08

if ! otel-cli --help 2>&1 >/dev/null; then

We should probably use something like

if ! command -v otel-cli 2>&1 >/dev/null

to check if the command exists first. Otherwise we get log output like

/home/runner/work/_temp/4bb311e7-86b2-4596-8ba4-3c1572bb63be.sh: line 1: otel-cli: command not found