[BUG] Local test instructions refer to non existent ./script/install-tools

[pflaquerre-figma]

What is the bug?

https://github.com/opensearch-project/terraform-provider-opensearch?tab=readme-ov-file#running-tests-locally refers to ./script/install-tools. Looks like this got deleted in 23b05e5?

[andrross]

Catch All Triage - 1