Fix curl auth issue

[oyvindhagberg]

There is a strange error that occurs when trying to authenticate with curl, that doesn't happen when authenticating with mreg-cli. I tracked it down to the following code: https://github.com/unioslo/mreg/blob/29005d08ebc66e4b22cac5bca8d3fc9aefe87917/mreg/log_processors.py#L42-L47

Apparently event_dict["content"] is sometimes a dict and sometimes a str.

This PR does the following:

• Adds a step to the workflow to test auth with curl
• Adds a type check to the filter_sensitive_data function to check whether the content is a dict or a str before attempting to replace the password with dots

[coveralls]

coverage: 99.162% (-0.03%) from 99.19% when pulling a7c378b34c56933886db1bf946e6be50a73dc38e on fix-curl-auth-issue-202309 into 29005d08ebc66e4b22cac5bca8d3fc9aefe87917 on master.