docs: "testing the configuration" in tabs

[eitansuez]

Description:

Several of the tasks have a section titled "Testing the configuration" which offers a way to test the configuration both with and without the support of an external load balancer.

The quickstart (latest version) was recently enhanced so that the two cases are presented in separate tabs using a tabbed pane widget.

It seems to me more logical to make the "with external load balancer support" case the default one -- i.e. the first tab. Currently the ordering is reversed.

The following tasks also have a similar section for testing the configuration in two ways, but do not employ tabs:

• tasks/traffic/http3.md
• tasks/security/tls-passthrough.md
• tasks/security/secure-gateways.md
• tasks/security/backend-tls.md
• tasks/security/mutual-tls.md
• tasks/security/tls-termination.md

Proposed changes to the docs:

1. Reverse the tab order - put the "with external load balancer" case first
2. Retrofit all other tasks to also use tabs

[arkodg]

+1