Trim trailing slash from AIGW URL

Mark Lapierrerequested to merge
573787-fix-ai-gateway-url-end-slash into master

What does this MR do and why?

This fixes errors that occur when the URL is joined to a path that starts with a slash, for example "#{base_url}/v1/search/gitlab-docs".

Previously, if the AIGW URL ended with a slash, classic Duo Chat would fail with an A9999 error because the AIGW would return a 404 error for a URL with 2 slashes.

Note that the Admin UI trims trailing slashes when the AIGW URL is entered, but that doesn't apply when the AIGW URL is entered via rails console, as Amazon Q customers are instructed to do.

References

How to set up and validate locally

  1. In rails console, enter the AIGW URL with a trailing slash

    Ai::Setting.instance.update!(ai_gateway_url: "http://gdk.test:5052/")

  2. Ask Classic Duo Chat a question.

Previously, this would return an A9999 error

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Edited by Mark Lapierre

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