Validate URL for backslashes at the end

[hguerrero]

Describe the bug

When setting the URL in the config to something like http://mydomain.com/ there is an error as it can't load the Keycloak configuration correctly.

We need to check if there is already a / and either remove it or not add an additional one.

Expected behavior

There is no difference on the behavior of an URL with or without trailing backlash

Actual behavior

It fails when setting the URL to something with a trailing backlash

How to Reproduce?

1. Add Microcks provider
2. Configure with trailing backslash
3. See the error in the log

Microcks version or git rev

1.9.0

Install method (docker-compose, helm chart, operator, docker-desktop extension,...)

backstage

Additional information

No response

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