Add a setting to skip TLS verification

**Is your feature request related to a problem? Please describe.**

I'm using Label Studio inside a Kubernetes cluster. I need to connect to the S3 storage in the same cluster. However the first problem is that inside the container, label studio needs the internal minio.:9000 to connect to S3 but on the browser when labeling the user needs the external minio..

Neither of these URLS is available in both situations. Fixing this temporarily is adding an entry to the kubernetes local dns so it resolves minio. to minio..

After solving this a new problem occurs. When trying to access a `url` type task via the presigned urls. I get an error when trying to connect to the URL, there is no TLS inside the kube cluster so I can't just put a certificate in `CUSTOM_CA_CERTS` and expect it to work for both.

**Describe the solution you'd like**
It would be nice if I could just skip TLS verification and run in insecure mode.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
TLS security doesn't matter for me because I'm in an air gapped server and all internal communication is insecure. Outside communication is secured by ingress