Refactor scripts to use command -v instead of which (#20306)

`which` is not a core package is some distributions.
Included changes from #20309 

Release Notes:

- N/A

script/bootstrap

@@ -11,7 +11,7 @@ else
 fi
 
 # Install sqlx-cli if needed
-if [[ "$(sqlx --version)" != "sqlx-cli 0.7.2" ]]; then
+if ! [[ "$(command -v sqlx)" && "$(sqlx --version)" == "sqlx-cli 0.7.2" ]]; then
     echo "sqlx-cli not found or not the required version, installing version 0.7.2..."
     cargo install sqlx-cli --version 0.7.2
 fi